Tamerlan Tsarnaev was a Soviet-born terrorist best remembered for planting two homemade pressure-cooker bombs at the 2013 Boston Marathon, killing three people. Many people were injured and 17 of those lost limbs. He planted the bombs with his brother Dzhokhar Tsarnaev and the two killed a policeman after the FBI declared them suspects. Tsarnaev was killed in the ensuing shootout.
Semion Mogilevich is an organized crime boss from Russia. Widely described as the boss of bosses, Mogilevich is believed to control the operations of a vast criminal empire. Even though the FBI considers him the most dangerous mobster, Semion Mogilevich lives freely in Moscow, thanks to his close alliances with important Ukrainian and Russian political figures, including Vladimir Putin.
Felix Yusupov was a Russian prince and count from the Yusupov family. He participated in the assassination of the controversial mystic Grigori Rasputin. He was born into a wealthy family and led a flamboyant life. He was happily married to Princess Irina of Russia, the niece of Tsar Nicholas II, for more than 50 years.
Known as the Chessboard Killer, Alexander Pichushkin set out to kill people matching all the 64 squares on his chessboard, and would cross out a square with every kill. Mostly targeting elderly people, he managed to kill about 48 to 60 people and was eventually sentenced to life imprisonment.
Chechen separatist Dokka Umarov later declared himself the emir of the Islamic Caucasus Emirate. Though a civil engineer by profession, he continued to indulge in criminal activities while working in Russia. He was eventually poisoned, and his body was found in a remote Russian area.
Darya Nikolayevna Saltykova was a noblewoman, serial killer, and sadist. She achieved notoriety for torturing and killing at least 38 female serfs. Since she was well-connected with the Russian nobility and with those in power at the royal court, Darya got away with many of her murders until she was found guilty in a trial organized by Empress Catherine II.
12 Fanny Kaplan
Born into a poverty-stricken family of farmers, Fanny Kaplan was home-schooled. Later, while working as a milliner, she joined the Socialist Revolutionary Party and thus became part of radical politics. She developed anti-Bolshevik sentiments and attempted to assassinate Lenin. Though Lenin recovered, Kaplan was later executed.
Anatoly Slivko made headlines when he was convicted of killing seven teenage boys in Russia. The serial killer admitted that he had killed the boys to recreate an incident where he had seen a young boy dying in a road accident and had been sexually aroused by the sight.