‘Griselda’ Boss on Sofía Vergara’s Dramatic Transformation: “She Does Terrible Things”

While Sofía Vergara was delighting millions of viewers for more than a decade as Gloria Pritchett on Modern Family, she was thinking about Griselda Blanco. For 15 years, Vergara pored over the life of the woman known as the cocaine trade pioneer — who also earned the nicknames “The Godmother” and “The Black Widow” — …