A convicted murderer who federal authorities say was working as a taxpayer-funded “Peace Ambassador” for the City of Los Angeles was arrested Friday for allegedly illegally possessing body armor near MacArthur Park. Michael Angel Alvarez, 41, also known as “Diablo,” was charged in a federal criminal complaint with possession of body armor by a violent felon, according to the U.S. Attorney’s Office. Federal investigators allege Alvarez was an active member and leader of the 18th Street gang while working through Healing Urban Barrios, a Lincoln Heights-based organization contracted by the city for its Peace Ambassador program in Council District 1,...