Final answer:
The law that prevents government agencies from disclosing personal information is the Privacy Act of 1974.
Step-by-step explanation:
The law that prevents government agencies from disclosing personal information that an individual supplies to the government under protected circumstances is the Privacy Act. The Privacy Act of 1974 prevents the unauthorized disclosure of personal information held by the federal government. It requires government agencies to protect the privacy of individuals by limiting the collection, use, and dissemination of personal information.