“What I want. What I am. What you force me to be is what you are.” This is a statement from the unforgettable report on race and poverty, titled “A Harlem Family, 1967,” that was published in Life magazine on March 8, 1968. It was written by Gordon Parks to accompany his own photographs, a poignant visual diary that documented the daily struggle of the Fontenelles, a family locked in a system dead set against it. “Look at me,” Parks wrote, speaking for Blacks in America, “and know that to destroy me is to destroy yourself.”

By this time, Parks had been a staff photographer at Life for 20 years and was an esteemed photojournalist who covered sports, theater, and fashion as well as race and civil rights. His portraits of racism, however, are in a class by themselves. At the Alison Jacques Gallery in London, an exhibition of his 1956 series “Segregation in the South,” photographed for Life, was on view until August 8; beginning on September 1, the gallery is exhibiting Parks’s portraits of Muhammad Ali, work done between 1966 and 1970. Describing the intent behind “Segregation in the South,” Parks said “I felt it is the heart, not the eye, that should determine the content of the photograph.” And yet there is a masterful eye behind the lens. Parks, to borrow a phrase from Ali, floats like a butterfly and stings like a bee.