In domestic policy, Sadat introduced greater political freedom and a new economic policy, the most important aspect of which was the infitah or "open door." This relaxed government controls over the economy and encouraged private investment. Sadat dismantled much of the policy apparatus and brought to trial a number of former government officials accused of criminal excesses during the Nasser era. Liberalization also included the reinstitution of due process and the legal banning of torture. Sadat tried to expand participation in the political process in the mid-1970s but later abandoned this effort. In the last years of his life, Egypt was racked by violence arising from discontent with Sadat's rule and sectarian tensions, and it experienced a renewed measure of repression. On October 6, 1981, President Sadat was assassinated by Islamic extremists. Hosni Mubarak, Vice President since 1975 and air force commander during the October 1973 war, was elected President later that month. He was re-elected to a second term in October 1987 and to a third term in October 1993. Mubarak has maintained Egypt's commitment to the Camp David peace process, while at the same time re-establishing Egypt's position as an Arab leader. Egypt was readmitted to the Arab League in 1989. Egypt has also played a moderating role in such international fora as the UN and the Nonaligned Movement.