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.
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.