gangs
n.
（罪犯有组织的）一帮( gang的名词复数 );
一伙;
（闹事青少年的）一群;
（工人有组织的）一队;
例句:
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There were gangs of kids on motorbikes roaming around.
过去有成群结队的年轻人骑着摩托车四处游荡。
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This attack stemmed from cyber gangs in Eastern Europe.
来自WSJ
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Marauding gangs of armed men have been looting food relief supplies.
持械抢劫团伙一直在四处抢劫救济食品。
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Gangs rioted last night, breaking storefront windows and hurling rocks and bottles.
几个帮派昨晚聚众闹事，他们打碎商店临街的玻璃窗，并投掷石块和瓶子。
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The attack was a bold move by the gangs.
来自BBC
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Corruption, gangs and guns have been around for decades.
来自BBC