What group is responsible for the assassinations of six americans in tehran during the 1970s? ?

MEK (The Mojahedin-e-Khalq) - The group has been designated as a foreign terrorist organization by the U. S. Department of State, mainly due to their assassination of six Americans and its anti-American activities during the Iranian revolution in 1979. The group was founded by six Muslim students who supported the Freedom Movement of Iran and supported the downfall of the Shah in 1979 and the rise of Ayatollah Khomeni.