It was not until the late 1980s that his books were released for publication in the Soviet Union .
Trotsky 's ideas formed the basis of Trotskyism , a major school of Marxist thought that opposes the theories of Stalinism .
It was not until the late 1980s that Trotsky 's books were released for publication in the Soviet Union .
Trotsky 's ideas formed the basis of Trotskyism , a major school of Marxist thought that opposes the theories of Stalinism .