We have several pilots who declined to become members during integration 10 years ago. Because NetJets is an "agency shop" and not a "closed shop," they elected to pay "agency fees" instead of dues and forfeit the full rights of a "member in good standing" which include running for union office or voting in elections for union leaders. They are still entitled to disciplinary action representation and benefit from group negotiation. The agency fees and union dues are roughly the same.
If they refuse to pay either, THEN they would be jeopardizing their employment.
Good news is, they aren't forced to endure the MB rantings of a certifiable lunatic from Arkansas.