Seen here on the campaign trail with then-candidate Donald Trump in 2016, Paul Manafort has been a fixture in Washington for decades. He worked for the campaigns of Presidents Gerald Ford and George H.W. Bush, as well as for unsuccessful 1996 candidate Bob Dole. Later, he began lobbying for foreign leaders in countries such as Saudi Arabia and for Russia-friendly politicians in Ukraine.

His firm Manafort, Black and Kelly lobbied the US government on behalf of a number of unsavory characters including dictators like former Angolan rebel leader Jonas Savimbi, Ferdinand Marcos of the Philippines, Ukraine's Viktor Yanukovych and others. Lobbying for foreign countries requires registration with the Justice Department, which Manafort failed to do.

Ukraine's government has accused Manafort of receiving illegal, off-the-record payments from its predecessor. Manafort was also accused of supporting the violent removal of protesters from Kyiv's Maidan Nezalezhnosti square during Ukraine's 2014 uprising. Dozens of demonstrators were shot by police.

As Manafort's trial began, one of the key witnesses against him was Rick Gates (left), who cut a deal with special counsel Robert Mueller. Gates pleaded guilty in February 2018 and is cooperating with prosecutors. Gates has knowledge of Manafort's offshore bank accounts, his work for Ukraine and his relationship with Russian oligarch Oleg Deripaska.

In this photo from Manafort's consulting offices, Konstantin Kilimnik (left), who allegedly has ties to Russian intelligence, poses for a photo with Manafort and others. It is one of the few images known to exist of Kilimnik, who has been accused by the Mueller investigation of witness tampering.

After being indicted, Manafort was allowed to remain free on bail after posting a $10 million dollar bond. A judge sent him to prison when prosecutors accused him of attempting to tamper with the testimony of two witnesses. In prison, Manafort was given VIP treatment, which included a phone and a laptop.

On March 7, 2019, Manafort was sentenced to nearly four years in prison for tax fraud, bank fraud and failing to disclose foreign bank accounts. He was also ordered to pay more than $24 million in restitution. Manafort did not to testify during the trial, but after the verdict he said the ordeal had left him "professionally and financially in shambles."