take action against (someone or something)
To initiate legal proceedings against someone or something. Let it be known that my client will take action against any publication that prints these lies. The city has declined to take action against the man, stating that it was a clear case of self-defense.
take action against someone or something
to begin activity against someone or something. The city council vowed to take action against the mayor. I will take action against the company for its negligence.