伙 huǒ - this measure word is used for Groups, crowds, and gangs.
Example :
一伙年轻人
yīhuŏ niánqīngrén
a gang of young men.
这伙强盗目无法纪。
zhèhuŏ qiángdào mùwúfăjì
The group of bandits had no regard for laws.
一伙走私贩
yīhuŏ zŏusī fàn
a Group of smugglers.
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