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fhe Attorney General was advised that Chief Justice Earl Warren and the Vice President had been informed of the Plans of the CP to infiltrate the Pilgrimage and both had expressed concern over the developnents,. Refergnce described above eo F ot (9) A Bureau memo dated 4-24-57 captioned, "March on Washington, May 1957," indicated that Roy Wilkins, Executive Secretary of the NAACP was one of the leaders of the demonstration which was scheduled to take place in Washington, D.C. on 5-17-57, A Bureau meno dated 4-26-57, containing a sumnary of data regarding the March on Washington, which was prepared for dissenination, stated that Roy Wilkins was co-chairnan of the Prayer Pilgrimage and headquarters had heen established at the NAACP office at 20 West 40th Street, NYC. The meno also noted Roy Wilkins, Erecutive Secretary of the MAACP, the sponsoring organization, had estimated that 50,000 people would participate in the "prayer pilgrimage for freedon.” 9 Refergnce described above 62-191 087-167 (S77