Federal authorities Thursday designated the notorious Mara Salvatrucha MS-13 as a “transnational criminal organization,” giving federal authorities more tools to fight the street gang that has its roots in Los Angeles. Under the designation, federal officials said they can now seize assets of gang members found within the United States jurisdiction. The designation is the first for a U.S. street gang. Among the organizations similarly designated are Japan’s Yakuza and Mexico’s Zetas, whose leader, Heriberto Lazcano, was killed by Mexican Marines on Sunday. An armed gang later stole his body from a funeral parlor. ... MS-13 began among El Salvadoran...