After decades of waning influence, the labor movement in the United States appears to be having a resurgence. In July, UPS averted a strike by its largest union, the Teamsters, by agreeing to a contract that gave sizable raises to all of its 340,000 workers, with experienced drivers now earning at least $100,000 a year.
The number of strikes and the number of workers who have gone on strike has increased for the third consecutive year, with the Hollywood actors as well as the screenwriters having been on picket lines for months. Starbucks and Amazon have...