12801
Beginning in the early 1930 s there was a rapid increase in membership of trade unions in the United States , and with that came frequent and sometimes violent labour–management conflict .
 location: United States
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: United States 
Answer:
 location: United States