Kammala jumlar da ke gaba: Jacques ya shiga Jam'iyyar Kwaminis ta Burtaniya yana da shekara goma sha takwas, kuma a jami'o'in Manchester da Cambridge ya kasance mai himma sosai a siyasar ɗalibai. A shekarar 1966 ya kasance daya daga cikin manyan masu motsawa a bayan Radical Student Alliance, kungiyar hagu-na-tsakiya ta kusan dalibai 400 daga jami'o'i 108 da kwalejoji wadanda suka nemi gina yunkurin dalibai 'wanda zai iya daukar matakin gama gari kan al'amuran da suka shafi zamantakewar jama'a'. A Cambridge ya taimaka sosai wajen kafa kungiyar daliban Jami'ar Cambridge. A shekara ta 1967 ya kasance memba na Kwamitin Gudanarwa na Jam'iyyar Kwaminis, "mai yiwuwa mafi ƙanƙanta memba a kusa da ashirin da biyu", kuma ya kasance memba har zuwa 1991. Mai zurfin tasiri ta hanyar
mamayewar Soviet na Czechoslovakia da abubuwan da suka faru a watan Mayu a Paris a 1968, wanda ya bayyana a matsayin "haihuwarsa ta siyasa", yana ɗaya daga cikin shugabannin farko na Eurocommunist ko bangaren gyara na jam'iyyar, musamman tasirin aikin Antonio Gramsci. A cikin 1976, a cikin wani rahoto ga Kwamitin Zartarwa na Jam'iyyar Kwaminis, ya yi jayayya cewa 'gwagwarmayar aji ba ta iyakance ga gwagwarmayar tattalin arziki... amma kuma tana da akida da al'adu'. Daga baya a waccan shekarar an zaɓe shi, tare da mai bin al'adun gargajiya George Matthews, don kammala sabunta fasalin "Hanyar Burtaniya zuwa Socialism" (shirin Jam'iyyar Kwaminis) don gabatarwa ga Jam'iyyar ta 35th National Congress a 1977. Daga baya ya bayyana wannan tsari a matsayin 'Mexican stand-off', amma tasirin ra'ayoyin Gramscian ya kasance a bayyane a cikin shirin karshe, wanda ya yi kira ga 'babban ƙawancen dimokiradiyya' kuma ya tabbatar da cewa ci gaban ci gaba ya buƙaci 'ba kawai... ya zama ƙungiyar ƙungiyoyi ba... amma na wasu mahimman ƙarfi a cikin al'umma waɗanda ke fitowa daga yankunan zalunci ba koyaushe suna da alaƙa kai tsaye da dangantakar samarwa ba.'