Operation Gideon was the code name given to the expulsion of the inhabitants of the Baysan Valley. It was implemented by the Haganah's Golani Brigade between 10 and 15 May 1948, just before the establishment of the state of Israel. It is possible that the Irgun Zvai Leumi also took part in this offensive, since it announced on 14 May that it had taken five Arab villages in the north.
The New York Times. 14 May 1948, 15 May 1948.
Morris, Benny. The Birth of the Palestinian Refugee Problem 1947-1949. Cambridge: Cambridge University Press, 1978, p. xv, 75, 105-57.