Heroin Traffic:

Some amazing coincidences linking the CIA, the Mafia, Air America, several members of the Brook Club, Chiang Kai-Shek, The Kuomintang, Prince Puchartra of Thailand, many banks and insurance companies, Pan-am, Jimmy Hoffa - practically everyone except Richard Nixon. Wasn't he asked?

https://www.cia.gov/library/readingroom/docs/CIA-RDP74B00415R000400170053-8.pdf