Richard,
Time Stands Still probably knows exactly what he is talking about. I too have had a St. Thomas Aquinas parent say nearly the same thing to me.
The rule states those that are directly or indirectly associated with the school. I don't know whether that gets too fuzzy for the activity association to act when parents acting independently are involved, but there are certainly are some ethical problems.
As a former coach I do not know how many of my best wrestlers were actually contacted, but I can name one and that was confirmed by his parents. He was not new to my program either, he was going to be a junior.
Whether these are provable offenses or just provable ethical problems, I am not sure. But they are an area of concern.
Gary Ulmer