“Fight Night: The Million Dollar Heist” and “Say Nothing” both take place during the “Me” Decade, but in wildly different worlds. Peacock’s “Fight Night” unfolds in Atlanta in 1970, when Muhammad Ali flew into town and won his comeback fight after a three-year boxing ban, while the country’s most powerful figures in the Black Mafia got robbed at a party celebrating that victory. Across the Atlantic and up through the Irish Sea to Belfast is FX’s “Say Nothing,” which chronicles the Troubles in Northern Ireland beginning in the early ’70s. On one side: suave gangsters led by Samuel L. Jackson’s Frank “the Black Godfather” Moten. On the other: working-class members of the paramilitary Irish Republican Army fighting for a united republic free of British soldiers. Here, we dive into both limi

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