AP Photo/Jacquelyn Martin Lesa Curtis of Westchester, New York, right, who is pro-agency fees and a former president of her union, rallies outside of the Supreme Court in Washington, Monday, January 11, 2016, as the court heard arguments in the Friedrichs v. California Teachers Association case. T his isn’t your father’s labor movement. Back when my dad was a Cleveland bus driver and member of the Amalgamated Transit Union, Americans had a more common lived experience. Everyone in your hometown read the same newspaper and watched the same television shows. The people on your block belonged to the same civic associations and bowling leagues. The chatter around the water cooler, the local diner, or the school lockers covered more or less the same, reliable topics. Often, our mothers and fathers worked for one of just a handful of major local employers (though if you were African American, your career options were limited and upward mobility was quite rare). Religious faith bonded people...