Founded the Betar company at Kfar Saba and in 1933 served as its commander.
In 1931 graduated from a Haganah commander's course, and in 1933 joined the Irgun.
In 1937 served as Commander of Tel Aviv District and a member of the General Headquarters. Together with Hanoch Kalai, was one of the first to break the havlaga (self-restraint policy); commanded and participated in many defensive operations.
In 1938 was sent to Poland to organize Irgun cells and commanded a first commanders course there.
On return to Eretz Israel, organized the disembarkation of illegal immigrants from Af-Al-Pi vessels.
In 1939 was arrested with members of the General Headquarters and released at the end of 1940. Arrested many times in 1944-1946 and spent most of the time under house arrest.
Returned to activity several months before the state of Israel was established, and commanded a Platoon in the Battalion 35 of the Irgun within the Givati Brigade. Wounded during the conquest of Yavneh.
Was manager of ZOA House in Tel Aviv.