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An important but surprisingly little-remembered story in the history of pro football - and a turning point in the city of New Orleans' eventually successful pursuit of an NFL franchise - is the subject of this week's hugely intriguing conversation with Erin Grayson Sapp, author of "Moving the Chains: The Civil Rights Protest That Saved the Saints And Transformed New Orleans".   From the book's dust-jacket:   We remember the 1966 birth of the New Orleans Saints as a shady quid pro quo between the NFL commissioner and a Louisiana congressman. Moving the Chains is the untold story of the athlete protest that necessitated this backroom deal, as New Orleans scrambled to respond to a very public repudiation of the racist policies that governed the city.   In the decade that preceded the 1965 athlete walkout, a reactionary backlash had swept through Louisiana, bringing with it a host of new segregation laws and enough social strong-arming to quash any complaints, even from suffering sports promoters. Nationwide pro