Aug 31, - Triads, Yakuza have a hand in golf and slavery. More than 10, people marched in the February funeral procession for Chen Yung-ho and Ning Lei-chia, reported leaders of the Four Seas triad in Taiwan. The Chinese gangs are best known for trafficking in heroin and opium, but. Sep 3, - By the time Tom Yu began investigating Asian gangs for the L.A. . The news spread quickly in Chinatown and in law enforcement circles.