In the early 1990s poker was very different. In particular, almost any behavior was tolerated: players threw cards at the dealer, said enough to bring a dealer to tears, "accidentally" burnt a dealer with a cigar (and i heard about card throwing that one dealer suffered eye damage from this).
I guess as poker got bigger, they started to institute penalties (anteing while sitting out for a few rounds was a great idea) which were very effective although some players got away with more than others.
Anyway, in the early 1990s, I was at the final table with 3 other players and two of them, one of whom was well-known player and the other I forget his name, never got into hands against each other. If one was on the small blind and his "partner" who was sitting next to him was thus on the big, if neither I nor the 4th player was in, he would simply fold.
I complained to the tournament director and he said, verbatim iirc, "what do you want me to do about it?" and indeed nothing happened. this was for that time and place a fairly decent-sized event, first place was over 30k.
So my question is, even today, how is that sort of thing dealt with? The rules about verbal abuse/card throwing are enforced but how does one prove this kind of collusion and if proven, what is the penalty?