Rowling writes that there are 700 Quidditch fouls listed in the Department of Magical Games and Sports records, but most of these fouls are not open to the public, owing to the Department's supposed fear the wizards/witches who read the list of fouls "might get ideas".
Blagging: No player may seize any part of an opponent's broom to slow or hinder the player (Draco Malfoy commits this foul in Prisoner of Azkaban, by grabbing Harry's broomtail to stop him from seizing the Snitch).