pronoun
Plural of あいつ; derogatory or familiar, used for people the speaker looks down on or is close to. Often carries a rough, masculine tone.
あいつら、また遅刻かよ。
Those guys are late again, huh?
あいつらに任せたらめちゃくちゃにされた。
When I left it to them, they made a mess of it.
Plural form of あいつ, which is a contraction of あの奴 (ano yatsu, 'that fellow'). The plural suffix ら is added to form あいつら.