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Zengakuren have been involved in, for example, the Anti-red purge movement, the overall peace treaty movement and opposition against the Korean War in its first stage.
After activities concerning revision of the Japan-US Security Treaty in 1960, the league was divided. Subsequently, each organization after the split of 1960 continues to use the Zengakuren name. At the time of writing, five bodies are operating under the name "Zengakuren".