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However , the 1960 s witnessed a revival of anarchism , likely caused by a perceived failure of Marxism–Leninism and tensions built by the Cold War .
 Marxism–Leninism
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Marxism–Leninism