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According to its programme RUFS was a counter-wight to MUF , FPU and other youth leagues as well as an alternative to the established left-wing youth leagues KU and SSU .
 MUF, FPU, KU, SSU
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 MUF, FPU, KU, SSU