1981
The MEK detonated bombs in the offices of the Islamic Republic Party and the prime minister, killing about 70 high-ranking officials.
1980s
The Iranian government expelled the MEK leadership and many moved to France. By 1987, most of the group's leaders had resettled in Iraq.
1982
Feb. 8: Mousa Khiabani and Ashraf Rajavi and 20 other members were killed in a shootout with the Iranian Revolutionary Guards Corps (IRGC) in Tehran.
1986
The MEK moved its headquarters to Iraq.
1991
The MEK assisted the Iraqi government in suppressing Shi'ite and Kurdish uprisings.
1992
The MEK attacked 13 Iranian embassies in different countries.
1999
April 11: MEK claimed responsibility for the assassination of Iranian Gen. Ali Sayid Shirazi in Tehran.
June 9: A truck exploded next to a bus carrying MEK members in Baghdad. The explosion killed seven and wounded 23.
2000
Feb. 5: The MEK launched a mortar attack against the presidential palace in Tehran, killing one and injuring five.
2003
The MEK negotiated a cease-fire agreement negotiated with coalition forces. As a condition of this agreement, the MEK relinquished control of more than 2,000 tanks, armored personnel carriers, and heavy artillery.
June 3: Australian federal police raided the homes of several MEK suspects in Melbourne. The police were investigating possible financial links with the MEK in Iraq.
June 17: French police arrested almost 200 MEK members, including MEK leader Maryam Rajavi. Most were released shortly thereafter, including Rajavi, who is now in hiding.
2005
November: Iran admitted the U.N.'s nuclear watchdog to its Parchin military base for a second time to check for signs of radioactivity. Weeks earlier, the political arm of the MEK held a press conference in Washington and presented photographs and diagrams of tunnels and underground installations at Parchin. Those facilities, said the group, are intended to conceal nuclear activities.
2006
July: Iraqi Prime Minister Nuri al-Maliki accused the MEK of becoming too involved in Iraqi affairs and threatened to expel the group.
2007
March: The Iraqi government pressed charges against 100 MEK members for alleged human-rights violations. Some analysts viewed the changes as part of a stepped-up effort to evict the group.
2008
June: Britain removed the MEK from its list of terrorist organizations.
October: The E.U. removed the MEK from its list of terrorist organizations. It remains on the U.S. list of Foreign Terrorist Organizations.