Anti-corruption within the European Union is generally based on a double strategy: raising public awareness about the problem has increasingly become over the recent years one of the top priorities in the anti-corruption field. Besides and in order to enhance public participation in the fight against corruption, the Advocacy and Legal Advice Centre (ALACs) have become over the last years an important instrument of both citizens empowerment in general and anti-corruption in particular. ALACs enable direct engagement of citizens in the fight against corruption and empower both victims and witnesses of corruption and provide channels for their grievances. The paper provides first a short introduction into ALACs as an important anti-corruption tool. On the basis of results generated in the frame of the EU-funded research project “ALACs: the paper focuses on the issue of whistleblowing as well as on protection of whistleblowers as a condition sine qua non for a more effective fight against corruption. This issue is seen and analysed in close relationship to codes of conduct in public administrations and companies. Key Words: Corruption and Anti-corruption, Civil Society, Whistleblowing, Codes of Conduct.