In this essay, the author analyses 123 slogans of the extra-parliamentary left from 1968 to the Anni di Piombo. The slogans are examined from a linguistic, thematic and political perspective. After a linguistic analysis, the thematic cluster analysis reconstructs the main political ideas in this political area. The communication of the extra-parliamentary left is analysed linguistically in relation to the prevailing language of the political scene at the time and from a political point of view in connection with the parties represented in Parliament and the extra-parliamentary movements that followed an opposite ideological approach. The analysis shows an important linguistic and political break with the PCI, a break whose development and linguistic expression is reconstructed in this study. The various themes of the political-revolutionary movements of the extra-parliamentary left are analyzed in relation to the language register that characterizes them and which moves from a predominant gloom and violence in the field of militant anti-fascism to a desecrated humour towards the parliamentary left.