Final answer:
The PRSA revised its Code of Ethics in 1977 in response to an investigation by the U.S. Federal Trade Commission to ensure adherence to fair competition and antitrust laws.
Step-by-step explanation:
The PRSA revised its Code of Ethics provisions regarding competition in 1977 in response to an investigation by the U.S. Federal Trade Commission (FTC). This government agency is responsible for administering antitrust laws and ensuring that businesses adhere to fair competition practices, which includes preventing price fixing and deceptive practices. The revision of the PRSA Code of Ethics was part of a broader movement toward more robust ethical standards and practices within industries and professions during a time when public confidence in government and various institutions was low due to events like the Vietnam War and the Watergate scandal. The U.S. Equal Employment Opportunity Commission (EEOC) also played a role in advocating for fair practices in the workplace, but it is the FTC that directly relates to matters of competition and industry regulations.