On 1 September 1969, a group of rebel military officers led by Muammar Gaddafi launched a coup d'état against King Idris, which became known as the Al Fateh Revolution. Gaddafi was referred to as the "Brother Leader and Guide of the Revolution" in government statements and the official Libyan press. Moving to reduce Italian influence, in October 1970 all Italian-owned assets were expropriated and the 12,000-strong Italian community was expelled from Libya alongside the smaller community of Libyan Jews. The day became a national holiday known as "Vengeance Day". Libya's increase in prosperity was accompanied by increased internal political repression, and political dissent was made illegal under Law 75 of 1973. Widespread surveillance of the population was carried out through Gaddafi's Revolutionary Committees.