Anne Donlon delves into the history of the British Left after World War I to assert the significance of the Black and feminist interventions of Claude McKay and Sylvia Pankhurst. Donlon centers the publication of “A Black Man Replies,” McKay’s letter to the editor published in Pankhurst’s newspaper The Worker’s Dreadnought, against white supremacist logics mobilized by prominent 1920s leftists that contributed to the reestablishment of policing of and violence against black men. Donlon’s archival discoveries weave together biography, material cultural analysis, and histories of trans-Atlantic activism, and, in the process, reveal the labor of building radical intersectional solidarity that came before and followed the moment of “A Black Man Replies.”