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.
PROTEST, mar. law. A writing, attested by a justice of the peace or a consul, drawn by the master of a vessel, stating the severity of a voyage by which a ship has suffered, and showing it was not owing to the neglect or misconduct of the master.