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He was then the Southern Sectional Secretary of the Co-operative Union , leaving for a short while to be labour advisor to the Motor Agents ' Association before returning to the Union .
 organization: Co-operative Union
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: Co-operative Union 
Answer:
 organization: Co-operative Union