From Longman Dictionary of Contemporary Englishspeak out phrasal verbPROTESTto publicly speak in protest about something, especially when protesting could be dangerous about/against Five students who had spoken out against the regime were arrested. → speak→ See Verb table
Examples from the Corpus
speak about/against• For months, she had been speaking out against Gov.• Ramsey spoke out about his faith for Liberalism and talked eloquently about the freedom of Liberal minds.• E.' s leader, Chuck D., has spoken out against homosexuality on several occasions.• At each stop national and local campaigners will speak out about problems facing walkers.• Several spoke out against the harshly self-righteous tone of the original motion.• President Clinton and three of his top officials have spoken out against the initiative.• Smith was not afraid to speak out against the Vietnam War.• He also criticizes other ministers and Parliament in general who failed to speak out against these developments.• Mormon religious leaders generally became conservative Republicans who spoke out against trade unionism and welfare programs. 