1) Aggressor 2) Assailant 3) Assaulter 4) Attacker 5) Brute 6) Bully 7) Delinquent 8) Gangster 9) Happy hobo of old comic strip 10) Heavy 11) Hood 12) Lout 13) Mugger 14) Rough young person 15) Roughneck 16) Rowdy 17) Rowdy youth 18) Ruffian 19) Ruffian, yob 20) Thug 21) Tough 22) Tough guy 23) Undesirable 1) Bullyboy 2) Criminal 3) Go on 4) Loutish 5) Muscleman 6) Rioter 7) Roughneck 8) Ruffian 9) Skinhead 10) Thug 11) Yob 12) Yobbo 13) Yobo 
[Single] General-purpose caution sign, similar in intent to and derivative of :Image:Stop hand.svg. ...[fish] This is a category for all broad gauge railways built with a track gauge of {RailGauge|4ft10in}. ...
a ruffian or hoodlum.
This almost certainly comes from a twist on the surname Hoolihan. In the 1890s the English comic paper Nuggets featured an Irish immigrant family called the Hooligans, depicted in a typically pejorative way.
a cruel and brutal fellow