The demonstrations of June 5 and 6, also called the events of June 1963 or (using the Iranian calendar) the 15 Khordad uprising (Persian: تظاهرات پانزده خرداد‎), were protests in Iran against the arrest of Ayatollah Ruhollah Khomeini after his denouncement of Iranian Shah Mohammad Reza Pahlavi and Israel. The Shah's regime was taken by surprise by the massive public demonstrations of support, and although these were crushed within days by the police and military, the events established the importance and power of (Shia) religious opposition to the Shah, and Khomeini as a major political and religious leader. Fifteen years later, Khomeini was to lead the Iranian Revolution which overthrew the Shah and his Pahlavi dynasty and established the Islamic Republic of Iran.