Larry Glick was a radio legend. He had a talk show on WBZ in Boston for 20 years from the 60s to the 80s. WBZ was (is?) one of the big clear-channel AM stations, meaning they could broadcast at full power after dark. Glick's program went from something like 9pm - 1am, so most of the continental US and eastern Canada could hear him. I lived in northern Ontario, and WBZ was the most powerful signal apart from our local station.
He wasn't political; he just had a talent for talking to ordinary people and making it entertaining. People would call the show and talk about whatever they wanted. Occasionally he'd do interviews. Sometimes he'd just ring up phone booths and talk to whoever answered. A lot of this was driven by caller suggestions, and if they worked out, he'd send them a "Glick University" T-shirt, which became quite a collector's item.
Probably his most popular gimmick was a shotgun sound effect, which he'd use to dispatch callers who got annoying or weird. People would call in just to be shot off the air.