David Harris has died at the age of 76. A key leader of the draft resistance movement of the 1960s, Harris actively encouraged young people to resist being conscripted into the Vietnam War. He served 20 months behind bars for his own draft refusal. He spent four of those months in solitary confinement for organizing prisoner protests demanding humane conditions. Joan Baez, his wife at the time, wrote “A Song for David” while he was in prison. David Harris died of lung cancer on Monday at his home in Mill Valley, California.