This paper examines the way that collective identity was discursively constructed during the protests of December 2008 in Greece. Drawing on the framework of Critical Discourse Analysis, we study the interrelation between macro-level (dominant) values and views and micro-level individual positions, as expressed in graffiti slogans, a type of discourse that appeared during the protests. The graffiti come from two albums and a personal photo collection. We conduct a systemic functional analysis to scrutinize the transitivity structures of graffiti slogans and we employ the notion of anti-language as central at the micro-level. We draw on notions of insurrectionary collective action and collective identity to frame the graffiti at the macro-level. Among our main findings is that the writers of graffiti slogans construct their collective identity on a two-fold oppositional axis: the first consists of the dominant institutions or “others”, which are negatively represented, while the second consists of a positively represented and inclusive in-group or “we”.