Conservative, free-market groups across the country have launched campaigns aimed at persuading teachers to drop out of their unions, in the aftermath of a U.S. Supreme Court ruling that will put a dent in unions’ finances and membership numbers.

For the past year, union officials had been preparing to face both an adverse ruling in Janus v. American Federation of State, County, and Municipal Employees Council 31 — which in June determined public-employee unions could no longer collect fees from nonmembers for collective bargaining—and subsequent efforts by anti-union groups to get teachers to end their memberships. But the speed and scope of the anti-union messaging has been striking.

In some cases, school district officials have even stepped in to block the flow of these outside messages on school system email servers.

Right-leaning think tanks and advocacy organizations have placed anti-union ads on Google and social media and sent targeted emails to teachers across the country. Some plan to go door to door to reach educators during the summer.

Read the full article on the PBS Newshour website.