There was a time, not that long ago, when each of the six Black showrunners at tonight's "They Run the Show" panel at the Paley Center were the only African Americans in the writers' rooms they started out in. "I was the diversity," laughed Power showrunner Courtney Kemp Agboh about her days breaking into the business."After I left Girlfriends, I didn't work with another black individual for eight years," said Insecure showrunner Prentice Penny. "Eight years!?" marveled…

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