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The article examines Chilean muralism, looking at its role in articulating political struggles in urban public space through a visual political culture perspective that emphasizes its sociological and ideological context. The analysis characterizes the main themes and functions of left-wing brigade muralism and outlines four subpolitical phases: (i) Chilean mural painting’s beginnings in 1940–1950, especially following the influence of Mexican muralism, (ii) the development of brigade muralism for political persuasion under the context of revolutionary sociopolitical upheaval during the 1960s and in the socialist government of Allende from 1970 to 1973, (iii) the characteristics of muralism during the Pinochet dictatorship in the 1980s as a form of popular protest, and (iv) muralism to express broader social discontent during the return to democracy in the 1990s. How did the progressive popular culture movement represent, through murals, the political hopes during Allende’s government and then the political violence suffered under the military dictatorship? Several online repositories of photographs of left-wing brigade murals provide data for the analysis, which suggests that brigade muralism used murals mostly for political expression and for popular education. Visual art’s inherent political dimension is enmeshed in a field of power constituted by hegemony and confrontation. The muralist brigades executed murals to express their political views and offer them to all spectators because the street wall was within everyone's reach. These murals also suggested ideas that went beyond pictorial representation; thus, muralism was a process of education that invited the audience to decipher its polysemic elements.