 The Thurmans were at times criticized by those who felt they should be visibly active in the Civil Rights Movement, but they believed their commitment was to addressing the spiritual needs of those who were visible, rather than participating in marches, protests and demonstrations.Among the papers of MLK were many letters from people such as Homer A. Jack, who co-founded the Congress of Racial Equality; Lillian Smith, author of the novel Strange Fruit; Glenn E. Smiley, national field secretary of Fellowship of Reconciliation, as well as King's own acknowledgement, which credited their spiritual guidance.Thurman continued her writing work in Boston.