354563
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
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None