Perhaps mentioned in earlier threads, but a decent chunk of the IMSA grid of the middle 1980s went away for a while courtesy of the U.S. Government, including two of the three Whittington brothers -- how many other LeMans winners have been in prison for several years? Randy Lanier, an IMSA champion in a March 83G ("Blue Thunder Racing, " referred to by some as "White Powder Racing"), got a life sentence (recently commuted).
John Paul Sr. was imprisoned for drugs and escape among other activities (he had a huge underground marijuana grow room) and John Paul Jr. was convicted for drug offenses. This one was rather sad.; he was a teenager doing what his father told him to do.
It has long been said down here that John Paul Sr. was convicted of poor marksmanship. He fired five bullets into an informant stuffed in the trunk of a Mercedes ... and the man lived to sit on the witness stand in court and point at John Paul Sr as the man who attempted to kill him. Ooops.
There were others, well known for their "business" activities then. As they were never publicly named I won't name them now ... but I'll bet at least one photographer active on here knows about a few of them. Right, E1Pix?