Semion Yudkovich Mogilevich (Ukrainian: Семен Юдкович Могилевич, romanized: Semén Yúdkovych Mohylévych [seˈmɛn ˈjudkowɪtʃ moɦɪˈlɛwɪtʃ]; born June 30, 1946) is a Ukrainian-born Russian organized crime boss.

He has alliances with political figures, including Yury Luzhkov, the former Mayor of Moscow, Dmytro Firtash, and Leonid Derkach, former head of the Security Service of Ukraine.

[8][9][10] Oleksandr Turchynov, who was designated the acting President of Ukraine in February 2014, appeared in court in 2010 for allegedly destroying files pertaining to Mogilevich.

[19] His first significant fortune derived from scamming fellow Soviet Jews (mainly Ukrainian and Russian) eager to emigrate, including to Israel, the country where Mogilevich himself briefly lived in 1990.

According to some reports, Mogilevich earned a considerable amount of money as an intermediary selling jewelry and artwork belonging to Jews who emigrated from Kyiv in the 1980s.

Living in a fortified villa outside Budapest, he continued to invest in many enterprises; he bought a local armament factory, "Army Co-Op", which produced anti-aircraft guns.

"[30] In 1997 and 1998, the presence of Mogilevich, Mikhailov and others associated with the Russian Mafia behind a public company trading on the Toronto Stock Exchange (TSX), YBM Magnex International Inc., was exposed by Canadian journalists.

[31] In 1998, an FBI informant told the bureau that one of Mogilevich's chief lieutenants in Los Angeles met two Russians from New York City with Genovese crime family ties to broker a scheme to dump American toxic waste in Russia or Ukraine.

Mogilevich's man from L.A. said the Red Mafia would dispose of the toxic waste in the Chernobyl region (Ukraine) "probably through payoffs to the decontamination there," says a classified FBI report.

Estimates are that up to one-third of fuels sold went through this scheme, resulting in massive tax losses for various countries of Central Europe (Czech Republic, Hungary, Slovakia and Poland).

[38] In 2003, the United States Federal Bureau of Investigation placed Mogilevich on the "Wanted List" for participation in the scheme to defraud investors in Canadian company YBM Magnex International Inc.

[39] In a 2006 interview, former Clinton administration anti-organized-crime official Jon Winer said: "I can tell you that Semion Mogilevich is as serious an organized criminal as I have ever encountered and I am confident that he is responsible for contract killings.