Since 1951, Congress has barred government money for “publicity or propaganda”. Three times the government’s auditor caught an agency hiding its hand. Since 1951, Congress has written the same limit into its spending laws. Today it sits in Section 718 of Division E of the 2026 law, signed February 3: no appropriation may be used “for publicity or propaganda purposes within the United States not heretofore authorized by Congress”. The text was identical in 2014 and 2015. GAO, the federal auditor that ruled in the cases below, keeps asking one question: did the audience know who was talking. In 2004, GAO found that HHS paid for Medicare story packages, built to air as local news, that were “not attributed to CMS”. In 2005, the Education Department paid for Armstrong Williams to comment regularly on No Child Left Behind without disclosing its role, which GAO said “amounted to covert propaganda”. In 2015, an EPA Thunderclap message posted on 980 accounts and potentially reached about 1.8 million people without naming EPA. Each finding turned on one definition: covert propaganda is a message that hides the agency as its source. The findings do not bind the executive branch. On July 30, 2004, the Justice Department’s Office of Legal Counsel concluded the Medicare videos “do not constitute impermissible ‘covert propaganda’”. On the 2026 ads, GAO says only that it has a process, “which we are working through right now”. A precedent shows a test. It does not decide today’s case.