This session explores the institutionalization of radical/left social movements, considering the possibilities and pitfalls of political inclusion. The first paper proposes a theoretical and methodological framework for comparing historical assemblages where social movements have been first institutionalized into state political structures, followed by moments of de-étatization. It bridges social movement theory and historical-institutional theories of the developmental state. The second paper analyses the Brazilian Workers Party (PT), which unified diverse social movements in resistance to military dictatorship. Following electoral success, PT introduced innovative social policies from 2003-2015 but these have been pushed back since the 2016 coup. The third paper compares the trajectories of conditional cash transfer programmes implemented by social democratic governments accommodating radical social movement demands in post-dictatorship Brazil and Philippines, within broader contexts of changing overall patterns of inequality. It identifies two phases: an initial phase when cash transfer programmes formed part of social democratic expansion, and a recent phase of authoritarian neoliberalism following the recapture of the state apparatus by right-leaning political forces. The final paper explores the historical institutionalization of progressive social movements within social partnership arrangements of the Irish state. It interrogates the changing status of different actors involved in contesting the political landscape in post-recession Ireland, juxtaposing empirical findings on youth unemployment, precarious work and trade union membership with analyses of Irelands Generation What survey of 32,000 18-34 year olds. This sheds light on the millennial generation and issues of distrust and disengagement with existing/possible forms of social and political mobilization.