Task: Question Understanding
Input (English): Between 1783 and 1865, Englishmen William Wilberforce, Sir Cecil Wray and Dr Beilby Porteus, Africans Olaudah Equiano and Ignatius Sancho and, in the USA, William Lloyd Garrison, John Greenleaf Whittier, Harriet Beecher Stowe, Frederick Douglass, Charles Henry Langston and John Mercer Langston were leading figures in which movement?
Output (English): base