The political implementation of ideas No 126, 2019/2 - pagesPages 3 to 5EditorialPages 7 to 35The political implementation of ideas: For a social history of ideas in a partisan environmentBy Thibaut RioufreytPages 37 to 60Between “economic beliefs” and party constraintsBy Nicolas AzamPages 61 to 83Putting into the party versus putting into politicsBy Clémentine FauconnierPages 85 to 109The Party, the expert, and the economic theories: The French Socialist Party (1971-1981)By Mathieu FullaPages 111 to 134The socio-political career of the expression “the great replacement” among right-wing party networks in Germany: The case of the Alternative for Germany (AfD) partyBy Cécile LecontePages 135 to 161The career of “security” in the socialist milieu (1993-2012). Sociology of a partisan conversionBy Rafaël CosPages 163 to 192Activists locked in their role? Young protesters in the face of repression in BelarusBy Tatyana ShukanPages 193 to 215“You will find a way to be a leader”. Coopérative training and workers’ resistance in a factory taken over by its employeesBy Maxime QuijouxPages 217 to 220Coutant (Isabelle), Les migrants en bas de chez soi, Paris, Seuil, 2018, 224 p.By Clément RivièrePages 221 to 225Michelutti (Lucia), Hoque (Ashraf), Martin (Nicolas), Picherit (David), Rollier (Paul), Ruud (Arild E.), Still (Clarinda), Mafia Raj: The Rule of Bosses in South Asia, Stanford CA, Stanford University Press, 2018, 352 p.By Gabriel FacalPages 226 to 229Bonelli (Laurent), Carrié (Fabien), La Fabrique de la radicalité. Une sociologie des jeunes djihadistes français, Paris, Seuil, 2018, 312 p.By Thomas Mattei