The article aims to define how the main principles of the Swedish welfare state, i.e., the “multi-stakeholder principle” and the principle of trustfulness and collaboration, affect activity of the anti-corruption civil society. For the study, the following empirical methods have been used: the analysis of documents and in-depth-interviews with experts. The author demonstrates that the anti-corruption activity of civil society in Sweden can be considered as part of wider social movements for human rights, democracy and integrity, especially at international level. There are a lot of associations and unions in Sweden that, among other joint activities, promote anti-corruption practices and rules in state organisations and commercial enterprises. The state and government need to be oriented to social challenges and keep pace with civic movements. A partnership with different stakeholders is the main type of the Swedish ACS’s activities that help to reach their goals in preventing corruption behaviour, e.g., “Anti-corruption policy networks”, and it is the result of two types of collaboration: anti-corruption participation and anti-corruption services. The research has shown that the civil society’s ability to create networks with the state, business and other agents is the main condition for the so-called horizontal accountability and sustainability and for preventing corruption in Swedish society that, in its turn, has been established over a long period of time building the culture of integrity and civic institutions.