Prison watchdog groups are blaming Saturday’s prison riot in California on overcrowding. Two hundred prisoners were injured, including over fifty seriously, during a four-hour riot at the California Institution for Men in Chino. The prison was designed to hold 3,000 men, but the state was housing nearly twice that number. For years, California officials have ignored warnings about prison overcrowding. Two years ago, a prison expert warned that the prison in Chino was a “serious disturbance waiting to happen.” Some state prisons in California are at nearly 300 percent of intended capacity.