What's a word for a "parrot-like" person who attacks, criticizes, and postures loudly, but only from the shoulder of someone stronger, as it were? [closed]

I'm running into a person like this and cannot remember the term.

I imagine the archetype is common in mob-like organizations and criminal enterprise. A person who loves to join in the kicking but only when the person is victim is outnumbered, occupied, or helpless.

Somewhat like Zazu but he is a shade different (he may be right but is overexercising his authority or using it to say personal things).


Someone who runs with the pack? (In French I'd say: who howls with the wolves)