The Equalizer, on CBS
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This aired for four seasons, from 1985-89. I don't recall how much of it I ever saw, either when it first aired or in reruns. But I'm sure I liked it, and found it to be a clever and well-acted show.

Anyway, "the Equalizer" is Robert McCall (Edward Woodward). McCall apparently used to work for some government agency, the CIA or something like that. Now he is more of a private detective, although not exactly. Um, he runs an ad for people who need help to contact him and he'll... help them. It's not exactly detective work. It's problem solving, really. Sort of like a soldier of fortune, only more like a secret agent of fortune. Okay, fine, I don't really know what to call him, except just "the Equalizer." And he got help with the cases he took from various contacts and associates, most notably a guy named Mickey Kostmayer. Aside from that, I don't know what to tell you, though I'm sure I'd like to see it again someday.

In 2014, there was a film adaptation loosely based on the series. In 2021, there was a remake TV series, which I haven't seen.