the heavy mob/brigade
A group of heavily armed soldiers. The US is reportedly sending in a heavy brigade to quell unrest in the region.
A large group of people, especially one inclined toward violence or unrest. As the demonstration began, a heavy mob of masked men fell upon us and began assaulting anyone carrying a protest sign.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
the ˈheavy mob/brigade(British English, informal) a group of strong, often violent people employed to do something such as protect somebody: I had to laugh when he turned up at the meeting with his heavy mob, as if he was a mafia boss or something.
Farlex Partner Idioms Dictionary © Farlex 2017