You're referring to MEK (MKO,PMOI). They're marxist.
They can't be trusted not to kill ordinary Iranians who disagree with them. They are a cult who want to take over themselves.
They are still on the Terrorist List.
These are those Americans killed by MEK terrorists back in 1970s.
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MKO Assassinations
In the period leading up to the Iranian revolution and its immediate aftermath, the MKO carried out their strategy of armed struggle. The results included the murder of Americans, support for the seizure of the U.S. embassy, and opposition to the release of U.S. hostages. The Mojahedin are known to have assassinated the following Americans in Iran during the 1970s:
Lt. Colonel Lewis L. Hawkins Killed: June 2, 1973
Air Force Colonel Paul Schaeffer Killed: May 21, 1975
Air Force Lt. Colonel Jack Turner Killed: May 21, 1975
Donald G. Smith, Rockwell International Killed: August 28, 1976
Robert R. Krongrad, Rockwell International Killed: August 28, 1976
William C. Cottrell, Rockwell International Killed: August 28, 1976
Reza Reza'i, a member of the Mojahedin's Ideological Team, was arrested and executed by the Shah's government for the murder of Colonel Hawkins. The attacks on the Rockwell employees occurred on the anniversary of the arrest of a Mojahedin member, Rahman vahid Afrakhteh, for the murder of Colonels Schaeffer and Turner. In addition. Air Force Brigadier General Harold price was wounded in a 1972 attack Planned by Mojahedin Central committee member, Kazem Zul Ai-Anvar. Widely credited in Tehran for these attacks at the time, the Mojahedin themselves claimed responsibility for these murders in their publications.