Cheryl Mills: Woman at center of Clintonworld
Probes: Clinton Foundation; Clinton emails
Who is she: Long-term Clinton lawyer who advised Bill during impeachment then Hillary over emails; Foundation director; State Department chief of staff.
Cheryl Mills is unusual among Clinton insiders; she has already cut a deal with the FBI.
She exchanged partial immunity from prosecution in return for opening her laptop to FBI review during the Clinton email investigation.
Mills was chief of staff under Clinton at the State Department and communicated extensively on the Clintonemail.com private server.
The deal with the Justice Department - headed by Attorney-General Loretta Lynch - was hugely advantageous as it also limited the search to no later than January 31, 2015, the point at which the server's existence became known to a Congressional committee.
In March backups of Clinton's emails were destroyed by a technician, a move which could have been seen as illegal destruction of evidence.
And the deal allowed for the destruction of Mills' laptop. Heather Samuleson, another more junior aide, cut the same deal.
Mills went on to sit in with Clinton on her FBI interview in early July as her attorney, an unusual arrangement given that she had previously been a focus of the investigation.
However the renewed move by the FBI to examine the Huma Abedin emails on the Weiner laptop could set the immunity aside.
If they find new emails, those could open the way for prosecution. Equally, if they examine emails already seen on her laptop and conclude that they represent a case for prosecution over the handling of classified material, that too would be unlikely to be covered by the immunity deal.
In fact, any part of Mills' role in setting up the server could now be back in play. She was clearly identified in one of the Wikileaks emails as part of the reason for secrecy around Clinton.
That is only one of Mills' roles in Clintonworld which the FBI are concerned with.
The other is her role as director of the Clinton Foundation for two periods, 2004 to 2009 and then from 2013 on.
The influence-peddling investigation has not been the subject of public commentary by the FBI but would involve anyone who held a high-level role.
Mills was heavily involved in the Foundation not just as a director, but while she was working at the State Department.
During that time it was at the center of a fierce battle between Chelsea Clinton and Doug Band, in which Band was effectively forced out.
Mills drew up a new structure for all of Bill Clinton's operations - at the time it was the William J. Clinton Foundation - and, Wikileaks publication of John Podesta's email shows - took part in a number of exchanges about it.
The State Department has previously said that Mills paid her own way to go to Clinton Foundation meetings in New York.
But neither the department nor the Clintons have addressed whether the FBI is looking at whether the Clinton Foundation monetized access to the Secretary of State through the overlapping roles of, among others, Mills and Abedin.
Phillipe Reines: What does he know of emails and access?
Probes: Clinton emails; Clinton Foundation
Who is he: Hillary Clinton press secretary when she was senator; press secretary to failed 2008 presidential campaign and spokesman for Chelsea during it; Deputy Assistant Secretary of State for Hillary; played Donald Trump in debate prep.
As one of her inner circle at the State Department, Phillipe Reines was one of those - he told the FBI - who Clinton turned to for help with her IT issues.
He also bought her an iPad in June 2010, when the technology was new.
Clinton was to go on to claim she only had 'one device'. Reines meanwhile used both his state.gov email and his personal gmail for government business while in office.
Reines was also deeply involved in responding to the Benghazi committee's demands for information about the server and the public relations response to it, Wikileaks emails from John Podesta's gmail have revealed.
However the other Clinton Foundation probe could also drag in Reines.
Reines was a key member of the inner circle when Clinton was Secretary of State.
His official title was 'deputy assistant undersecretary' for strategy, effectively her most powerful public affairs adviser.
That means that any knowledge he has of how the Clinton machine in the State Department interacted with the Clinton Foundation and Bill Clinton Inc machines in Manhattan would be crucial to the FBI investigation
John Podesta: 'Dean' of Clintonworld
Probes: Clinton Foundation
Who is he: Bill Clinton's first White House deputy chief of staff and later chief of staff; founder of DC lobbying firm Podesta & Podesta, now the Podesta Group; took charge of the Clinton Foundation in 2011 ; now Hillary campaign chairman; at 67, often seen as the 'dean' of the Clinton political machine.
The leaks from John Podesta's emails revealed by Wikileaks have shown how he was a key player in the Clinton Foundation - at precisely the time that the focus of the FBI influence-peddling investigation is likely to be.
At the time Clinton was Secretary of State and Doug Band, who had effectively run the foundation, wrote a memo which emerged in Podesta's leaked emails.
In it, Band detailed the overlap between the commercial activities of Bill Clinton and the charitable fundraising of the William J. Clinton Foundation (now the Clinton Foundation) - material which is likely to be pertinent to the influence-peddling case.
Podesta's role at Foundation lasted into 2012, so his knowledge of how it interacted with Hillary Clinton's aides - particularly Cheryl Mills, with whom he was in frequent contact, according to the emails - would be relevant to the FBI probe.
Lobbyist: Tony Podesta is the brother of Clintonworld 'dean' John Podesta but is being investigated by the FBI over taking a contract from a firm which may have been a front for corrupt cash from Ukraine's deposed president Viktor Yanukovych - an ally of Vladimir Putin
Tony Podesta: Dined with Hillary, lobbied for Putin's ally?
Probe: Undeclared lobbying for foreign government
Who is he: Older brother of John Podesta, with whom he founded what is now The Podesta Group of which he is chairman; social acquaintance of the Clintons; Democratic fundraiser
The FBI and the Justice Department are investigating possible ties to alleged corruption involving the former president of Ukraine - and Podesta's firm is one of those targeted.
Perhaps surprisingly, the investigation also lapped at the Trump campaign, as its then chairman Paul Manafort stepped down in August when it was revealed that his company was also being investigated.
The broad-based investigation is looking into whether U.S. companies and the financial system were used to enable corruption by the party of former pro-Russian Ukrainian president Viktor Yanukovych, CNN reported.
The Podesta Group hired an independent legal firm to investigate whether it had been misled by the Center for a Modern Ukraine, a not-for-profit group linked to the ousted Ukrainian government, a spokeswoman for the group said in a statement to Reuters in August.
The key to the FBI investigation is that Manafort and his deputy Rick Gates may have been paid by the Yanukovych government to push its case in Washington without declaring that the money came from abroad.
One of the firms Gates appears to have hired to help push the Center for a Modern Ukraine was The Podesta Group.
The FBI will therefore look at whether Podesta knowingly or negligently breached laws requiring all foreign attempts to influence U.S. politics to be registered.
Yanukovych was ousted as Ukranie's leader in 2014 - and is exiled in southern Russia, after long-term accusations that he was a friend of Vladimir Putin.
The older Podesta, his brother's emails disclosed, remains extremely close to John, sharing the use of an apartment in New York until earlier this year. Official records also show he is a 'bundler' for Clinton who had raised $62,000 by the end of June.
It is a long-standing relationship. One email forced out of the State Department showed how in 2012 the Clinton Foundation used the then Secretary of State to host a dinner at her home where attendees included donors - and Podesta.
Doug Band: Man who made Bill rich
Probe: Clinton Foundation
Who is he: Bill Clinton's 'body man' in the White House; his chief aide after leaving office until 2011; CEO of Teneo Holdings.
The FBI investigation into whether the Clinton Foundation committed financial crimes or was involved in influence-peddling will inevitably focus on one man in particular: Band.
Band was at Bill Clinton's side to the same extent as Huma Abedin was at his wife's, starting as his 'body man' in the White House, putting himself through law school in the evenings, and then running Bill Clinton's post-presidency life.
His emails to Cheryl Mills and Huma Abedin which have emerged in lawsuits forcing publication by the State Department show how he sent messages asking for meetings for people described as 'friend' or 'good friend of ours'.
Any influence-peddling or financial crimes committed by the Foundation appear to have some connection to them, if they were to exist.
His explosive memo detailing the project to make Bill Clinton rich which he sent to John Podesta made clear how involved he was in 2011 in the Clintons' lives and finances.
'Independent of our fundraising and decision-making activities on behalf of the Foundation, we have dedicated ourselves to helping the President secure and engage in for-profit activities – including speeches, books, and advisory service engagements,' he wrote.
'In that context, we have in effect served as agents, lawyers, managers and implementers to secure speaking, business and advisory service deals.'
It also put a figure on Bill Clinton's personal gains via Band.
'Since 2001, President Clinton’s business arrangements have yielded more than $30 million for him personally, with $66 million to be paid out over the next nine years should he choose to continue with the current engagements,' it said.
His current exact status in the Clinton inner circle appears unclear. On the one hand he has not been pictured with the Clintons in many years or listed at their events.
On the other hand, he continues to donate to the Clinton cause and to those of its allies - he was one of the donors to Virginia governor Terry McAuliffe's PAC which was used to pay $500,000 to the FBI assistant director's wife for her failed campaign bid.
And in 2013 he asked John Podesta to help remove any stain on his reputation with a glowing letter of reference. Podesta obliged by redrafting it for him.
Justin Cooper: Smashed BlackBerry with a hammer
Probes: Clinton Email; Clinton Foundation
Who is he: Staff assistant for Oval Office operations in Bill's White House; Doug Band's right-hand man; edited Bill's memoir My Life; registered the notorious Clintonemail.com server; now works for Teneo with Band.
Justin Cooper's role in the Clintonemail.com secret server started at the very beginning of its operation: he registered its existence.
At the time he was being paid by the Clintons as a family aide and through the Clinton Foundation.
He told one Congressional Committee - the Oversight and Government Reform Committee - that he had no security clearance.
However as the man with complete control over the server, he had unlimited access to its contents. He also destroyed devices which had been linked to the server, including a BlackBerry smashed with a hammer.
He was not prosecuted under the initial inquiry but if the Huma Abedin-Anthony Weiner record leads to new evidence, such a deal would be off the table.
He was also at the very center of the Foundation's operations during much of the time Hillary Clinton was in office.
He frequently appears in the leaked John Podesta emails as 'justin@presidentclintonoffice.com' and is involved in a series of key meetings.
That would make him a key focus for the other investigation into the foundation he was so intimately involved in was a front for influence-peddling or financial crimes.
Anthony Weiner: Sexual sleaze
Probe: Sexting 15-year-old girl
Who is he: Former New York congressman when Clinton was senator; estranged husband of her key aide Huma Abedin; notorious serial sexter.
The FBI probe into Anthony Weiner is unlike any of the other Clinton associates and their family members.
Weiner is being investigated after DailyMail.com revealed how he had had a sexting 'relationship' with a 15-year-old girl who told him he was underage.
The girl told DailyMail.com that Weiner spoke about rape fantasies with her. She showed messages in which he spoke about being 'hard' and how he 'would bust that tight p****'.
The revelations came a month after Abedin had announced that her six-year-old marriage to him was over when he was caught sexting a woman in her 40s to whom he sent a picture of himself in bed, apparently aroused, with his son by Clinton's chief aide sleeping by his side.
The FBI moved on Weiner in the wake of the DailyMail.com revelations and seized all his mobile and electronic devices.
It was on a laptop he had used that they found emails 'relevant' to the discontinued Clinton email server investigation - setting off a bomb under the presidential election.
Weiner's computer was apparently being searched for child pornography at the time of the discovery.
The FBI now have a fresh search warrant which will allow them to examine the material found on the laptop which had apparently been stored by Huma Abedin.
The material could impact almost every one of the investigations listed by DailyMail.com.