claws and fangs; claws and tusks
Literal meaning: the claws and fangs (or tusks) of a beast. Often used metaphorically.
The tiger attacked with its claws and fangs bared.
means of causing harm; weapon; devious design
Figurative extension: something used as a tool or weapon to harm others, often implying cunning or underhandedness.
pawn; stooge; cat's-paw; right-hand man
A person used by someone else to do their dirty work; a tool or underling. Sense 4 (right-hand man) is a specific, somewhat positive variant of this idea, but still implies being used.
He used rumors as a weapon to bring down his rival.
He was acting as his boss's cat's-paw, carrying out the fraud.
The president relied on him as his right-hand man.