The USPS often is mischaracterized as a quasi governmental or private entity. It is neither. The USPS is a government agency that was created by Congress to achieve various public purposes. Federal law defines what products and services the Postal Service may offer.
Sedition and seditious libel were criminal offences under English common law, and are still criminal offences in Canada.
The U.S. Sedition Act first outlawed conspiracies to oppose any measure or measures of the government.. Going further, the act made it illegal for anyone to express any false, scandalous and malicious writing against Congress or the president.