Leibowitz called local black professionals as witnesses to show they were qualified for jury service. Leibowitz called John Sanford, an African-American of Scottsboro, who was educated, well-spoken, and respected. The defense attorney showed that "Mr. Sanford" was evidently qualified in all manner except by virtue of his race to be a candidate for participation in a jury. During the following cross-examination, Knight addressed the witness by his first name, "John." The first two times that he did so, Leibowitz asked the court to have him alter his behavior. He did not, and this insult eventually caused Leibowitz to leap to his feet saying, "Now listen, Mr. Attorney-General, I've warned you twice about your treatment of my witness. For the last time now, stand back, take your finger out of his eye, and call him mister", causing gasps from the public seated in the gallery. The judge abruptly interrupted Leibowitz.