LOS ANGELES (Reuters) - Alongside allegations such as secret messages written in urine, the opening of the Aryan Brotherhood trial includes a charge that late Mafia boss John Gotti asked the prison gang to carry out a hit. Assistant U.S. Attorney Michael Emmick told jurors in one of the largest death penalty cases in the United States that Gotti sought out the Aryan Brotherhood, also known as the Brand, in July 1996 after he was beaten by a black inmate, Walter Johnson, at the U.S. penitentiary in Marion, Illinois,