The Supreme Court’s Janus decision only applies to public-sector unions, barring them from compelling nonunion members to pay agency fees that are meant to cover the costs of collective bargaining and other union services. But some powerful private-sector unions — including the Teamsters, Service Employees International Union and the United Auto Workers — have organized a lot of government workers in recent decades, and they also face potential loss of revenue for recruiting new members. And anti-union advocates are also trying to curtailprivate-sector unions’ ability to collect agency fees by pushing so-called right to work laws nationwide. 

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