After Ayatollah Khomeini’s arrest in June 1963, his supporters staged the 15 Khordad uprising; the gravest political challenge to the Shah’s rule since Mosaddeq’s premiership of 1951–1953. Khomeini’s banishment from Iran in November 1964, however, provoked no serious political or social reaction. Khomeini’s loyal students in Qom issued declarations and tried in vain to convince the sources of emulation such as Ayatollah Kazem Shari’atmadari to cancel their regular classes at the seminary schools in protest against Khomeini’s exile. The bazaar in Tehran, a traditional bastion of Khomeini’s supporters, was agitated for a few days. But the religious sources of emulation were not willing to take the risk of antagonizing the regime of the Shah and jeopardizing the safety and welfare of the Qom seminary schools by calling on believers to openly oppose the regime. Subsequently, there were no signs of mass demonstrations typical of June 1963, and life resumed in Qom and elsewhere as if Khomeini and his cause had been forgotten. On January 21, 1965, Mohammad Bokhara’i, a member of the armed branch of the Coalition of Islamic Mourning Groups, shot and killed Prime Minister Hasan Ali Mansur in front of the parliament (majlis). This assassination and the subsequent trial of the members of the armed branch proved that Khomeini’s influence in society was deeper than it seemed.