Mir-Hossein Mousavi Iranian revolution neared, Mousavi, whose earliest political hero was Che Guevara, became more actively involved in the struggle. He initially participated in the establishment of the Jonbesh-e Mosalmanan-e Mobarez (Movement of Militant Muslims) alongside Habibollah Peyman which eventually led him to join ranks with Mohammad Beheshti, who was a close associate of the revolution leader, Ruhollah Khomeini, and abandoned his previous connections with Ali Shariati. Following the collapse of the Shah's regime in 1979, Mousavi helped Mohammad Beheshti found the Islamic Republican Party in 1979 in order to assist the establishment of the Islamic Republic in Iran and hasten the
Hossein Shariatmadari Mir Hossein Mousavi was trying to "escape punishment for murdering innocent people, holding riots, cooperating with foreigners and acting as America's fifth column inside the country" and called for Mousavi and former reformist President Mohammad Khatami to be tried in court for "horrible crimes and treason." In 2009, during the first contested presidential elections, Shariatmadari was announced that Mohammad Khatami would risk the same fate of Benazir Bhutto if he was elected. After the elections, alongside the Green Party protests, Shariatmadari accused Mir Hossein Mousavi of being a fifth column of the US and causing the deaths of many people.