'''Compulsory unionism''' is an arrangement where [[union]] membership is a necessary condition of [[employment]]. In labor law, this is called a "closed shop." As of 2016, twenty six states have laws prohibiting closed shops.<ref>{{cite web|url=http://www.nrtw.org/rtws.htm
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'''Compulsory unionism''' is an arrangement where [[union]] membership is a necessary condition of [[employment]]. In labor law, this is called a "closed shop." As of 2016, twenty-eight states have laws prohibiting closed shops.<ref>{{cite web|url=http://www.nrtw.org/rtws.htm |title=Right to Work States|accessdate=February 17, 2018}}</ref>
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|title=Right to Work States|accessdate=April 30, 2016}}</ref>