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The league , based in San Francisco , attempted to financially harm laundries run by Japanese American s using four different tactics : picketing laundries , following customers back to their homes and intimidating them , preventing the laundries from purchasing equipment , and threatening public officials who refused to punish the laundries .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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