Gloria Steinem, Jesse Jackson, Bonnie Raitt and Jay Leno have joined prison hunger strikers in calling for an end to California's use of solitary confinement to control prison gang violence. The civil rights crusaders, singer and late-night comedian are among those who signed a letter sent Monday to Gov. Jerry Brown. The letter calls isolation units "extensions of the same inhumanity practiced at Abu Ghraib and Guantanamo Bay." The letter to Brown, to be followed by a demonstration Tuesday at the Capitol, was arranged by the National Religion Campaign Against Torture and local supporters of the prison protesters. The organization,...