All 3 Uses

denounce
in
The Narrative of the Life of Frederick Douglass
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What I got from Sheridan was a bold denunciation of slavery, and a powerful vindication of human rights.
Chpt 7 *

denunciation = strong criticism
It required a degree of courage unknown to them to do so; for just at that time, the slightest manifestation of humanity toward a colored person was denounced as abolitionism, and that name subjected its bearer to frightful liabilities.†
Chpt 10

denounced = strongly criticized or accused publicly OR (more rarely) informed against someone
Its sympathy for my brethren in bonds—its scathing denunciations of slaveholders—its faithful exposures of slavery—and its powerful attacks upon the upholders of the institution—sent a thrill of joy through my soul, such as I had never felt before!†
Chpt 11

denunciations = criticisms or accusations

Definitions:

(1) (denounce)
to strongly criticize or accuse publicly

or more rarely: to inform against someone (turn someone into the authorities)
(2) (meaning too rare to warrant focus)
Much more rarely, denounce can indicate the termination of a treaty or other formal agreement.