"The U.S. Information and Educational Exchange Act of 1948 (Public Law 80-402), popularly called the Smith–Mundt Act, is the basic legislative authorization for propaganda activities conducted by the U.S. Department of State, sometimes called 'public diplomacy.' [...] The Smith-Mundt Modernization Act of 2012 [...] allowing for materials produced by the State Department and the Broadcasting Board of Governors (BBG) to be available within the United States."

https://en.wikipedia.org/wiki/Smith–Mundt_Act