The reputed head of the United Bamboo Gang in Southern California has been charged in a federal investigation with conspiracy to participate in the 1984 murder of Chinese-American journalist Henry Liu. However, Liu’s widow said she believes the gang leader, Chang An-lo, is innocent after he called her from his Los Angeles jail cell Tuesday night. “He said he wanted me to trust him. He said he had nothing to do with Henry’s murder,” said Helen Liu in a telephone interview from her Bay Area home. “From the contact I’ve had with him before, I think he’s sincere.” Chang, a former Stanford University graduate student who is known to gang members as White Wolf, was charged Monday along with 10 other gang members with racketeering as part of their membership in the Taiwan-based international crime syndicate.