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Explanation:
A little more than three months after the debut of the Black Panther character, the Black Panther Party was officially founded in Oakland, in 1966. Which came first is what came first kind of thing. In 1972, with Fantastic Four no. 119, Marvel unveiled a new name for the character. I reached out to writer Roy Thomas, who penned the comic in which T’Challa pulled on his costume and explained why he’d suddenly started calling himself “the Black Leopard.”
“Since the debut of Marvel’s Black Panther had coincided, roughly, with the rise of the Black Panther Party, that had made Stan [Lee] and Marvel concerned that we’d become identified with that group,” Thomas said. “And we weren’t for or against it.”“I wound up being the guy who wrote that story, in my first-ever Fantastic Four story (ironically set in Rudyarda, a fictitious stand-in for South Africa under apartheid), and I worked in an explanation of sorts,” he continued. “But Stan soon thought better of it, and I don’t think the Black Leopard ever appeared as such in many stories.”
Atticle from The Ringer