The Postal Reorganization Act of 1970 was a law passed by the United States Congress that abolished the then U.S. Post Office Department, which was a part of the Cabinet, and created the U.S.

Prior to the act, postal workers were not permitted by law to engage in collective bargaining.

In the act, the four major postal unions (National Association of Letter Carriers, American Postal Workers Union, National Postal Mail Handlers Union, and the National Rural Letter Carriers' Association) won full collective bargaining rights: the right to negotiate on wages, benefits and working conditions, although they still were not allowed the right to strike.

[3] The first paragraph of the act reads:[2] The United States Postal Service shall be operated as a basic and fundamental service provided to the people by the Government of the United States, authorized by the Constitution, created by Act of Congress, and supported by the people.

The costs of establishing and maintaining the Postal Service shall not be apportioned to impair the overall value of such service to the people.The Postal Reorganization Act (at 39 USC 410(c)(2)) exempts the USPS from Freedom of Information Act (FOIA) disclosure of "information of a commercial nature, including trade secrets, whether or not obtained from a person outside the Postal Service, which under good business practice would not be publicly disclosed".