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While they may be considered unnecessary in most cases , trade union involvement and membership may be welcomed by some cooperatives , be it to show voluntary solidarity with the organized labor movement 's own history of struggle or to allow workers to negotiate collectively for the furtherance of workers ' special interests within the more democratic and representative cooperative .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None