Collocations for denounce - verb

angrily, bitterly, roundly, strongly
openly, publicly
He was publicly denounced as a traitor.

for
The government was bitterly denounced for the emergency measures.

to
Someone must have denounced them to the authorities.

be widely denounced
These new regulations have been widely denounced.

Denounce is used with these nouns as the object:
massacre, slavery, violence