Who is Alexander Vinnik, the Russian prisoner being traded for American Marc Fogel?

FILE PHOTO: Alexander Vinnik, a Russian man (C) suspected of running a money laundering operation using bitcoin, is escorted by police officers to a court in Thessaloniki, Greece, October 11, 2017. REUTERS/Alexandros Avramidis/File Photo

(Reuters) - The United States will release Russian Alexander Vinnik, a suspected cybercrime kingpin, as part of an exchange with Russia that freed Marc Fogel, a U.S. official said on Wednesday.

Vinnik operated BTC-e, once one of the world's largest cryptocurrency exchanges. He was arrested in 2017 in a small beachside village in northern Greece and detained at Washington's request on suspicion of laundering $4 billion through the exchange.