Around 20 years ago I used to listen to him on my lunchbreaks when he was on WJFK. This was during the golden age of the "Hot Talk" format, when they had Howard Stern on in the mornings and Don and Mike during the evening drive. He was completely batcrap crazy, and I rarely agreed with what he said, but he was endlessly entertaining.
I listened to him occasionally, and it seemed to me that he was generally very courteous to callers, even those with whom he disagreed. You don't see that much anymore.
He was in prison throughout my high school years, so I never met him. His daughter Sandy was in my high school class, and is also a Terp. One of my brothers was pals with his son Tom back in the day. I went over to the Liddy house once for a small party (probably my senior year of high school), some girl showed up wasted (I don't remember any drinking at their house) and she hurled big time at the bottom of their stairs, into an off-white shag carpet.
There was a story that once out of prison, some neighborhood kids had been up to some shenanigans at their house and he hid on the roof, and jumped off to the ground to catch them in the act.
They story had a ring of authenticity to it.
At some point they moved from this house to one on the Potomac, a very tiny and rare neighborhood centered around Lark Lane* in Oxon Hill. They probably call it Fort Washington now. This was our local Lovers' Lane, where one could take a date to "watch the submarine races".
At some point after my use of the lane was completed the neighbors had enough and got the river side posted as "no parking". Still, people tried. I heard that some guy in a pickup was parked there, Gordon came out to confront the violators, and the guy ran into him hard with the truck, inflicting injuries. Again, sounds like Liddy again.
The whole family was very conservative politically (unlike me), but I don't have a bad word to say about my classmate, she was nothing but gracious and friendly to me or anyone else we shared as friends. I think Gordon was a stern but decent father (except for his terrible error in judgement that resulted in an extensive prison term), and a warm grandparent.
*EDIT - after looking at a map, the actual river side drive is "Riverside Drive". Lark is one way to get there, but it's what we all called the whole area.