And punishable by treble damages, through RICO racketeering statutes. I worked for many unions doing corporate campaign research during the 1980s. Sad to see the most militant comrades quiver like jelly unless a good front group (like a student or community protest movement) was involved in, say, a hit on a bank for financing LBOs (the real ones) or strike-busting funds; always needed a South Africa or community reinvestment handle. Oh well, the silver lining was that at least the threat of Taft-Hartley+RICO made for relatively better balanced coalition power and for greater union sensitivities...