Community organising is subject to several interpretations, and community practises have spread worldwide over the last three decades. This paper understands community organising as a distinct methodology adopted by very different actors under very different objectives and uses it as a critical concept to analyse the role of the voluntary sector in social services. Through an account of the social service of Geneva, Switzerland focusing on community organising between 2002 and 2017, I offer a defence against the managerialist justification relied upon by the city's municipal council when it shut down the unit. The argument is premised on an appeal to a liberally conceived right to equality of opportunity for freedom of association. It supports an orthodox view of community organising as a bottom-up way of working for certain social services of public administrations, which justifies an exceptional and circumstantiated deviation from public management core principles.