A derogatory, familiar pronoun meaning 'they' or 'those guys'; used to refer to people in a contemptuous or casual way.
あの奴ら、約束を守らなかった。
Those guys didn't keep their promise.
奴らがまた来る前にここを出よう。
Let's get out of here before they come again.
なんで奴らだけ特別扱いするんだ？
Why do they get special treatment?