Be careful which union leaders you don't back down against!
I had a labor union BA back me up against a wall with a snub nose 38 when I challenged him.
He was a real bad actor, Jitterbug Jackson, he was the treasurer of local 300, Los Angeles, and stole the unions funds. 4 years later he returned and was elected president of the union.
I know the feeling, and I'm always careful because I have children. I also will not back down in a meaningful sense, although I may use a different approach in the face of a loaded gun (which I have experienced with union thugs too). We cannot let them learn that a loaded gun will bring them victory, or decent people will face more union guns than we do already.