After the extremely violent final match of the first Quidditch World Cup in 1473, seven hundred fouls were identified and listed. Most of these violent fouls were the result of players using wands to curse opposing players, which led in 1538 to an outright ban on using a wand against the opposing team.
The official rules, set down by the Department of Magical Games and Sports in 1750, include this statement:
Wands may be taken on to the pitch’ but must under no circumstances whatsoever be used against opposing team members, any opposing team member’s broom, the referee, any of the balls, or any member of the crowd.
Members of the crowd, however, don’t tend to follow such rules, sometimes resulting in chaos, as happened in an infamous Puddlemere United and Holyhead Harpies contest (DP4).
An attempts to ban wands being brought into Quidditch stadiums by spectators at the 1974 Quidditch World Cup was the cause of the incident known as "Royston Idlewind and the Dissimulators" - where wizards were able to outwit the Ministry officials who had organised the tournament (Pm).