The main purpose of this legislation, known as the Hire American Act, is to limit employment in the federal government to only U.S. citizens and nationals. This act aims to prioritize American workers for government jobs and restrict the hiring of noncitizens, except in certain specified situations. Key provisions of the act include a requirement that individuals must sign an affidavit confirming their citizenship status before being hired by the federal government. Additionally, the hiring agency must verify this information.