受伤的工人们正在对他们的雇主采取法律诉讼。

The injured workers are taking legal ___action against their employer.

信函威胁说，如果月底前未付款，将采取法律诉讼。

The letter threatened legal ___action if payment wasn't made by the end of the month.

该患者对医院提起了医疗事故诉讼。

The patient filed a medical malpractice ___action against the hospital.