High-security prisons across California have tightly restricted movement, calls and visits while officials probe a surge in violence this year. The restrictions started Saturday and affect the top-security sections of nearly a dozen lockups including the California Correctional Institution, California State Prison-Los Angeles County and California State Prison-Sacramento. Under the protocols, meals must be delivered directly to housing units and showers and any other movements must be done in a “controlled manner,” the California Department of Corrections and Rehabilitation said in a statement.