The United States Postal Service (USPS) management just ran into a possible game-changing obstacle to its shameful pursuit of a fully privatized post office: labor solidarity. Here’s the background. For a decade the USPS has been aggressively shrinking, consolidating, and outsourcing the nation’s postal system. In July 2011 management upped the ante by announcing the rapid closure of 3600 local post offices, a step toward the eventual closing of as many as 15,000, half of all post offices in the nation.