In September of this year, he hired Alastor "Mad-Eye" Moody, the notoriously jinx-happy ex-Auror, to teach Defense Against the Dark Arts, a decision that caused many raised eyebrows at the Ministry of Magic, given Moody’s well-known habit of attacking anybody who makes a sudden movement in his presence.
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He was a notorious drug dealer.
He is notorious for flagrant fouls and losing his temper.