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One of the major reason why the soviet union invaded Afghanistan is to promote Marxist Leninist revolutionary idea.
The correct answer here is the second option.
Debs was a Socialist Party member and one of the most prominent socialist political figures in the United States. He became a leader of the strikers in the Pullman Strike and was later convicted for disobeying court order. He proclaimed himself a socialist and ran for president of the United States as a socialist candidate numerous times. He opposed the US entry in the World War as he believed the reason for that was greed.