LOS ANGELES (Reuters) - Christmas may not be quite so merry in California's prisons this year. Orange, raisins and sugar have been banned for inmates in a bid to crack down on brews of that old and potent alcoholic prison brew known as pruno. "Pruno has always been there. Inmates make it up for holidays, Christmas, Thanksgiving, whatever. Just like everybody lays in wine and champagne and spirits for the holidays, inmates too want to prepare themselves for the holidays," said California Department of Corrections spokeswoman Margot Bach. "The problem is that pruno is tied into assaults. They get...