Labor Zionist leader, writer, and Yiddish philologist. He became active in the Zionist movement, joining the Poale Zion in 1905. Because of his activities, Borochov was arrested by the Russian police and made his escape from the country in 1907. He came to the U.S. in 1914, where he continued to be active in the Labor Zionist movement. He edited Der Yiddisher Kempfer and other publications and wrote books on Yiddish philology. His important theories on Socialism and Zionism were published in 1937 in Nationalism and the Class Struggle, a Marxist approach to the Jewish problem. Borochov returned to Russia after the Revolution in 1917, and died there shortly afterward. Ber Borochov was one of the founders of the World Confederation of Poale Zion in 1907, and Labor Zionism owes much to him. He formulated theories fusing Zionism and Socialism, and his ideas served greatly to win the sympathy of many labor and socialist circles for the Jewish upbuilding of Israel.