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On 5 March 1950 in the Casa dell Aviatore ( Aviator House ) in  Rome  253 delegates participated to the founder meeting of the  Italian Labour Union  ( UIL ) a new trade union strongly social democratic and reformist .
 city of headquarters: Rome, Italian Labour Union
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
Answer:
 city of headquarters: Rome, Italian Labour Union