Massachusetts General Laws Part I. Administration of the Government (Ch. 1-182) Ch. 152, § 66

Actions brought against employers to recover damages for personal injuries or consequential damages sustained within or without the commonwealth by an employee in the course of his employment or for death resulting from personal injury so sustained shall be commenced within twenty years from the date the employee first became aware of the causal relationship between the disability and his employment. In such actions brought by said employees or by the Workers' Compensation Trust Fund pursuant to the provisions of subsection (8) of section sixty-five, it shall not be a defense: