The paper reviews the anticorruption efforts pursued by transnational CSOs, what these organizations are, their structures and how they are evolving. It seeks to capture the activities and functions of the movement and the kind of methods they employ to achieve their goals. The paper identifies the following areas of tension: (i) issues of legitimacy and representation among transnational CSOs; (ii) the grey areas in the notion of global civil society; (iii) the North-South divide; (iv) the composition and membership of transnational civil society movements; (v) the movements’ increasing use of new technology; and (vi) fallibility as an emerging concern of civil society.