Mousavi and his wife had an active role in the success of the Revolution. He was imprisoned for organizing street protests against the monarchy of Shah Mohammad Reza Pahlavi. As the 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.