Dr. Margaree Seawright Crosby became the first African-American woman to receive a full professorship in Clemson University’s College of Education after earning her PhD. She is now a professor emerita there. But, in 1960, she and seven other high school and college students – including Jesse Jackson – walked into the Greenville, SC, downtown library and into the history books as the “Greenville 8.” The result of the “sit-in” sent them to jail for using the “whites only” facility on Main St…