Denounce

verb
to accuse or condemn or openly or formally or brand as disgraceful
“He denounced the government action”
Similar: stigmatize, stigmatise, brand, mark
verb
announce the termination of, as of treaties
verb
give away information about somebody
“He told on his classmate who had cheated on the exam”
Similar: tell on, betray, give away, rat, grass, shit
verb
speak out against
“He denounced the Nazis”