Right. To peel back the onion one layer at a time, there was revolution going on inside Iran involving Communists, the Mujahedin-e-Khalq, and the supporters of Grand Ayatollah Khomeini. These three elements were all fighting against the Shah. What the United States especially tries to do is to ignore the fact that in 1953 it was the U.S. CIA that backed a very violent overthrow of the leader then and put a very brutal person in charge, the Shah. So a war was raging in that country during that timeframe, and then there were splinter elements from there.
I do know about the blame for the killing of the three American officers and three Rockwell employees. When the Shah's police captured the people responsible for doing it, they all stated they were from the Marxist PMOI. Now, there were battles between the government forces and even after Khomeini took power, within the MeK. That's where Mr. Rajavi's first wife, Ashraf, was killed in one of those attacks.