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ILWU to Shut Down West Coast Ports May 1 Demanding End to War . .  San Francisco  CA USA In the US the ILWU struck amid hysteria and in defiance of the  slave  labor Taft-Hartley Act to defend its union hiring hall against the . . http://www.indybay.org/newsitems/2008/03/01/18482849.php .
 None
Given options, please tell me the relationships of all the listed entity pairs.Output format is "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} 
 Entity Pairs:   
Answer:
 NA: San Francisco, slave