A sociology of punishment for international criminal justice enables attention to the norms, morals, and values at play in the motivational dynamics of penal reforms. At the same time, these cultural forces must be analysed against the background of social organization and structure, indeed, as to what enables people to think and feel in certain ways and to promote policies in accordance with their sensibilities. As such, this chapter explores international criminal justice as a field replete with cosmopolitan sensibilities, but also of lifestyles, qualifications, and restraints. Finding that international criminal justice is perceived as a cosmopolitan expression of social justice, the first part conceptualizes human rights NGOs working in international criminal justice as global moral entrepreneurs and shows how they use humanist discourses to promote global justice-making through law, turning them into advocates of international criminal justice. Balancing claims to authority in the field, the NGOs have to navigate between being ‘insiders’ as experts and ‘outsiders’ that can claim moral authority. The analysis draws on scholarship inspired by Bourdieu and is put to work on transnational fields, enabling attention to what is often downplayed in studies of international law, namely class. As such, the chapter inquires into whose imaginations of global justice become part of its materiality, finding that advocates of humanity predominantly belong to a class of transnational western professionals.