This article explores radio broadcasting and monitoring by and about Sudan People's Liberation Movement/Army (SPLM/A) leader John Garang during Sudan's second civil war, focusing on the core period of Radio SPLA broadcasting (1984–91). Through oral history, memoirs, and international monitoring reports, the article analyzes radio conversations between Garang and his critics — northern Sudanese, southern Sudanese, and international — to argue that radio battles directly shaped the struggle for political authority between Garang and the Sudanese government, and within the SPLM/A elite. Radio allowed Garang to speak to a dispersed audience within and beyond Sudan, presenting an alternative history of Sudan, publicizing his vision of a New Sudan, and asserting his pseudo-sovereign control of SPLM/A-held territory. However, Radio SPLA did not exist in a vacuum; Garang's rivals responded on government and international radio to criticize his leadership in targeted, personal terms. Radio thus powerfully mediated between personal, national, and international politics during the SPLM/A's liberation struggle.