The Occupational Safety and Health Act of 1970 provides the national framework for worker protections and empowers the Occupational Safety and Health Administration (OSHA) to create and enforce worker protection standards. The OSH Act authorizes states to apply to OSHA for delegation of this authority (referred to as “state plan states”). In addition to these agency actions, however, the OSH Act also empowers the workers themselves to stand up for these rights, and to complain to agencies when they believe their rights are being violated. Beginning in 1973, OSHA has promulgated regulations formalizing employee rights to be free of adverse actions by their employers – “discrimination” in the language of the law and regulations – for exercising their rights to self-protection (codified in 29 Code of Federal Regulations (CFR) part 1977). Effective September 3, 2021, OSHA has updated these part 1977 regulations to track US Supreme Court decisions that tend to narrow employee rights somewhat. The remainder of this note summarizes OSHA’s part 1977 regulations and discusses the latest revisions.