Nice grammar. He was expelled in his third year because he was framed for opening the chamber of secrets with Aragog (it was actually Tom Riddle AKA Voldemort with the basilisk), so they snapped his wand and kicked him out of school. But Dumbledore, who believed he was innocent correctly, convinced Dippet to give him the gameskeeper joke. It was grounds and gamekeeper, a necessary job. Hagrid wsn't supposed to use a wand. But that pink flowered unmbrella he carried was a disguised wand. One might wonder where he got it.