A group of full-time, non-tenured professors at Northeastern University have dropped their petition to form a union in an effort to avoid a pro-employer ruling on faculty organizing from the Republican-controlled National Labor Relations Board.

The move by the group and organizers at the Service Employees International Union suggests that colleges and universities across the country that prefer to keep a union out of their workplace will have an easier time doing so under President Donald Trump’s NLRB.

The organizing...