The Kahan Commission (ועדת כהן), formally known as the Commission of Inquiry into the Events at the Refugee Camps in Beirut, was established by the Israeli government on 28 September 1982, to investigate the Sabra and Shatila massacre (16–18 September 1982). The Kahan Commission was chaired by the President of the Supreme Court, Yitzhak Kahan. Its other two members were Supreme Court Judge Aharon Barak, and Major general (res.) Yona Efrat. The Commission was to make recommendations on Israeli involvement in the massacre through an investigation of:
Following a four-month investigation, on 8 February 1983, the Kahan Commission submitted its report, which was released to the public by spokesman Bezalel Gordon simultaneously in Hebrew and English. It concluded that direct responsibility rested with the Gemayel Phalangists led by Fadi Frem, and that no Israelis were deemed directly responsible, although Israel was held to be indirectly responsible.
The Defence minister Ariel Sharon was found to bear personal responsibility"for ignoring the danger of bloodshed and revenge" and "not taking appropriate measures to prevent bloodshed". Sharon's negligence in protecting the civilian population of Beirut, which had come under Israeli control, amounted to a non-fulfillment of a duty with which the Defence Minister was charged, and it was recommended that Sharon be dismissed as Defence Minister.
Initially, Sharon refused to resign, and Prime Minister Menachem Begin refused to fire him. However, following a peace march against the government, as the marchers were dispersing, a grenade was thrown into the crowd, killing Emil Grunzweig, a reserve combat officer and peace activist, and wounding half a dozen others, including the son of the Interior Minister. Although Sharon resigned as Defence Minister, he remained in the Cabinet as a Minister without Portfolio. Years later Sharon would be elected Israel's Prime Minister.
The Commission arrived to similar conclusions with respect to Chief of Staff, Lt. Gen. Rafael Eitan (tantamount to a breach of duty that was incumbent upon the Chief of Staff), as well as Director of Military Intelligence, Major general Yehoshua Saguy, and other Intelligence officials — though the Mossad was not reprimanded and parts of the report commenting on its role remain under military censorship.