The correct answer is:
W. E. B. Du Bois.
The Niagara Movement was a civil rights association established in 1905 by a group directed by W. E. B. Du Bois and William Monroe Trotter.
Named after the mighty current of reform the group desired to produce, and the Niagara Falls in Ontario, where the opening meeting took place. They called for resistance to racial segregation and disenfranchisement, as well as to policies of accommodation and conciliation promoted by other African-American referents.