In 2020, over 100 million Americans voted before Election Day. Most of these voters required the effort of United States Postal Service (USPS) workers in some capacity, either to receive their ballots or to return them. Perhaps at no time in American history has the labor of postal workers been more visible or politicized, particularly given that Trump megadonor and Postmaster General Louis DeJoy sought to slow down the mail in order to improve the president's chances of reelection.

If there were one other time in which postal labor attracted as much attention, however, that would be the American postal worker strike of 1970, the primary subject of Philip Rubio's Undelivered: From the Great Postal Strike of 1970 to the Manufactured Crisis of the U.S. Postal Service. In this book, Rubio argues the strike of 1970, which likely included two hundred thousand workers across the country, has not received enough...

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