Peter Yarrow, one-third of the hit-making 1960s folk group Peter, Paul and Mary, and a Jewish activist who promoted Israeli-Palestinian coexistence and other progressive causes, has died at age 86. The longtime resident of Manhattan’s Upper West Side entered hospice last month. The cause of death was bladder cancer. Yarrow was a Cornell graduate playing in Greenwich Village clubs during the early 1960s folk revival when manager and musical impresario Albert Grossman, who also steered Bob Dylan’s career, suggested he team up with the Kentucky-born singer Mary Travers.