Ludovic Bagman

Ludovic "Ludo" Bagman was the Head of the Department of Magical Games and Sports in the Ministry of Magic until mid-1995, when he had to go on the run from goblins whom he had lost several bets against.

Bagman was once Beater for the Wimbourne Wasps Quidditch team.

Bagman was accused of passing information to Death Eater Augustus Rookwood the first time Lord Voldemort was powerful. He was never convicted, and it is likely that if he did pass any information to Rookwood, he did so innocently, not knowing Rookwood was working for Voldemort.