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In page Leon Trotsky:
When the XVth Party Congress made United Opposition views incompatible with membership in the Communist Party, Zinoviev, Kamenev and their supporters capitulated and renounced their alliance with the Left Opposition. Trotsky and most of his followers, on the other hand, refused to surrender and stayed the course. Trotsky was exiled to Alma Ata, Kazakhstan on 31 January 1928. He was expelled from the Soviet Union to Turkey in February 1929, accompanied by his wife Natalia Sedova and their eldest son, Lev.