Every single one was charged with crimes related to Trump and Russia and the Mueller report specifically notes that the investigation was impeded by lack of cooperation: "Third, the investigation established that several individuals affiliated with the Trump Campaign lied to the Office, and to Congress, about their interactions with Russian-affiliated individuals and related matters. Those lies materially impaired the investigation of Russian election interference. The Office charged some of those lies as violations of the federal false-statements statute."

On Manafort:
"Manafort's trial in the U.S. District Court for the District of Columbia was scheduled to begin in September 2018.[243] He was charged with conspiracy to defraud the United States, money laundering, failing to register as a foreign lobbyist, making false statements to investigators, and witness tampering.[244] On September 14, 2018, Manafort entered into a plea deal with prosecutors and pleaded guilty to two charges: conspiracy to defraud the United States and witness tampering.[245] He also agreed to forfeit to the government cash and property worth an estimated $11-$26 million,[246] and to co-operate fully with the Special Counsel.[247] A tentative sentencing date for Manafort's guilty plea in the D.C. case has been set for March 2019.[248]

Mueller's office stated in a November 26, 2018, court filing that Manafort had repeatedly lied to prosecutors about a variety of matters, breaching the terms of his plea agreement. Manafort's attorneys disputed the assertion.[249] On December 7, 2018, the special counsel's office filed a document with the court listing five areas in which they say Manafort lied to them, which they said negated the plea agreement.[248] DC District Court judge Amy Berman Jackson ruled on February 13, 2019, that Manafort had violated his plea deal by repeatedly lying to prosecutors.[250]

In a February 7, 2019, hearing before U.S. District Court for the District of Columbia Judge Amy Berman Jackson, prosecutors speculated that Manafort had concealed facts about his activities to enhance the possibility of his receiving a pardon. They said that Manafort's work with Ukraine had continued after he had made his plea deal and that during the Trump campaign, he met with his campaign deputy Rick Gates, who also had pleaded guilty in the case, and with alleged Russian Federation intelligence agent, Konstantin Kilimnik, in an exclusive New York cigar bar. Gates said the three left the premises separately, each using different exits.[251]

On March 13, 2019, Jackson sentenced Manafort to 73 months in prison, with 30 months concurrent with the jail time he received in the Virginia case, for a resultant sentence of an additional 43 months in jail (30 additional months for conspiracy to defraud the United States and 13 additional months for witness tampering). Manafort also apologized for his actions.[29][30][252] "