Fifty-five years ago, in a speech to the convention of the Illinois AFL-CIO, the Rev. Martin Luther King Jr. laid out with characteristic moral clarity the essential role of unions in American life. “The labor movement,” he explained, “was the principal force that transformed misery and despair into hope and progress … [When] the wave of union organization crested over the nation, it carried to secure shores not only itself but the whole society. Civilization began to grow in the economic life of man, and a decent life with a sense of security and dignity became a reality rather than a distant dream.”

This Labor Day, America’s working families are facing unprecedented challenges.