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suffixed to words indicating a class of people to create a plural (esp. in impolite contexts)
「輩」 has other readings with different meanings.
あの輩には関わらないほうがいい。
You'd better not get involved with those guys.
若い輩にも意見を聞くべきだ。
You should listen to the opinions of the younger ones too.
そういう輩は信用できない。
You can't trust people like that.