“[Melvin] Belli appeared in 'And the Children Shall Lead', a 1968 episode of the original Star Trek series. In it he appears as 'Gorgan, the Friendly Angel', an evil being who corrupts a group of children.”

“In his best-known case, Belli represented Jack Ruby, after Ruby shot and killed Lee Harvey Oswald.”

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https://en.wikipedia.org/wiki/Melvin_Belli