This article delves into the thought of an author who has not been studied. Besides, it understands that the best way to begin this study is through the Free Assembly of Puerta del Sol in Madrid on May 15th. García Calvo’s position was not influential in this Movement, but it can help us understand it in its origin, in the subsequent development and even in current days. Especially in its inner contradictions: those so called two M15’s souls. The article also analyzes the relationship of the Indignants’ Movement with the 1965’s students’ riot, where García Calvo was also a protagonist. Finally, the article focuses on one of the biggest discrepancies of the thinker from Zamora about the Spanish Revolution, concerning the assessment of Information and Communication Technologies.