This work reconstructs the strategic use Gandhi as a multi-layered “signifier” in the political thought of the Black Atlantic, intersecting the struggle against white supremacy and the decolonization processes. The discursive practices that have made metaphorical alliances with the Gandhian movement are highlighted here as a means by which the political discourse of the African diaspora crisscrosses and subverts the separation line between metropoles and colonies as a spatial construction of modernity. This analysis spans from the aftermath of the First World War to the second half of the 1950s. That part of the short 20th century was characterized by important turning points, the First and Second World War, the League against Imperialism, the Pan-African Congresses, which consolidated the awareness of a common experience of racial oppression and exploitation shared by colonial peoples and the African diaspora. The analysis is focused on editorial and associations circuits, and movements, such as the Pan-African Congresses (1919-1945), the “New Negro” movement, the Garveyite movement, Black trade unionism, and African liberation movements, in particular the Positive Action in Ghana, the Zikist movement in Nigeria, and the Defiance Campaign in South Africa. In this complex framework of hierarchies and idiosyncrasies, differences and similarities in the use of Gandhi as a political trope will be highlighted, and connected with different perspectives, or visions of solidarity.