He was notably involved in the Lillehammer affair, an attempted revenge killing following the Munich massacre that instead resulted in the murder of an innocent individual in a case of mistaken identity.

In 1943, he joined the Palmach, the elite strike force of the Haganah, and participated in a 1945 raid on the Atlit detention camp which freed 208 Jewish hostages held by the British authorities as illegal immigrants, and the Night of the Bridges.

In what became known as the Lillehammer affair, Harari led a team into Norway where they believed Ali Hassan Salameh, the chief of Black September operations was living.

[4] In January 1979, Harari led a team that killed Ali Hassan Salameh in Beirut with a car bomb, the same man he had tried to assassinate in Lillehammer years earlier.

[citation needed] He returned to Israel just before or during the 1989 United States invasion of Panama, which deposed Manuel Noriega and installed the legitimate presidential victor, Guillermo Endara.