Born in Russia in 1917 and immigrated to Eretz Israel with his parents in 1925.

Joined the Irgun at a young age, and in 1938 was in charge of the Irgun's operations in Jerusalem. Took part in the Irgun Commander Course in Poland, organized and directed by the Polish Army.

Returned to Eretz Israel after the publication of the British "White Paper", and took part in the operations against British targets in Jerusalem.

During the split in the Irgun (in 1940) he sided with Avraham Stern (Yair) and was one of the founders of Lehi.