Context: In the 1990s, initiatives were taken at an international level (in particular by the European Community, the Council of Europe, the OECD) to put a ban on corruption: in 1996, the Committee of Ministers of the Council of Europe, for instance, adopted a comprehensive Programme of Action against Corruption and, subsequently, issued a series of anti-corruption standard-setting instruments:

Question: What decade saw international initiatives to combat corruption?
Answer: 1990s

Question: Who started the Programme of Action?
Answer: Ministers of the Council of Europe

Question: What did the Programme of Action issue?
Answer: a series of anti-corruption standard-setting instruments