When Ryan Millsap arrived in Atlanta from California a decade ago, the real estate investor set his sights on becoming a major player in Georgia’s booming film industry. In just a few years, he achieved that, opening a movie studio that attracted big-budget productions like “Venom,” Marvel’s alien villain, and “Lovecraft Country,” HBO’s fictional drama centered on the racial terror of Jim Crow America. As he rose to prominence, Millsap cultivated important relationships with Black leaders and Jewish colleagues and won accolades for his commitment to diversity. But allegations brought by his former attorney present a starkly different picture. In...