 Complete the following phrase:  From 1978 until 1983, Bergman was a producer, reporter and then in charge of investigative reporting at ABC News. He was one of the original producers of a href20202028US20television20series292020a. In 1983, Bergman joined CBS News as a producer for the weekly newsmagazine 60 Minutes and its lead correspondent, Mike Wallace. Over the course of 14 years, he produced more than 50 stories, ranging from exposes of organized crime, international arms dealing featuring Sarkis Soghanalian, then the worlds main supplier to Saddam Hussein, and others to international drug trafficking in Venezuela involving the CIA to the 