denounce
verb
speak out against
“He denounced the Nazis”
to accuse or condemn or openly or formally or brand as disgraceful
“He denounced the government action”
“She was stigmatized by society because she had a child out of wedlock”
announce the termination of, as of treaties
give away information about somebody
“He told on his classmate who had cheated on the exam”
Source: WordNet 3.1, Princeton University