From 1931 -- 1940 , he was a member of the national Haganah command center .
From 1920 -- 1930 , he was a member of the central Haganah committee .
From 1931 -- 1940 , member was a member of the national Haganah command center .
From 1920 -- 1930 , he was a member of the central Haganah committee .