In the 1920s, Boleslavski's students at the American Laboratory Theatre
school in New York included Lee Strasberg, Stella Adler
and Harold Clurman, all of whom were to become active members of The
Group Theater (1931-1939), the first ensemble company in America to
apply the Stanislavski System to American acting.
In the Russo-Polish War of 1920, Boleslawski fought as a soldier in the
Polish Army and took part in the Polish invasion of the Ukraine,
shortly before the war ended.