Hoodlums

Someone told me there are too many hoodlums at the school near my house.

Hoodlum?

What a strange word. It means a young troublemaker; a thug; ruffian; or a violent and rough youth.

But where did it come from? Wiktionary tells me German, from huddlellump. I tend to think that it has something to do with gangsters and robbers wearing "hoods." It became common usage in San Francisco around 1933.