Duquesne University in Washington D.C. has to recognize its’ adjunct faculty union, according to an NLRB ruling this month. The University’s McAnulty College and Graduate School of Liberal Arts voted to form a union in 2012. The NLRB’s regional D.C. office validated the union’s legitimacy, but Duquesne appealed the decision, arguing that their religious affiliation exempts them from coverage under the National Labor Relations Act. After the national labor board upheld the regional office’s decision, the university said that it plans to file an appeal in federal court.
See "Campus Notebook: National Labor Relations Board rules against university", James Dearie, National Catholic Reporter, March 21, 2018