This book analyzes the innovative international intervention instruments against corruption in Central America called Hybrid Anticorruption Agencies or HACAS. The author aims to disclose and explain the decision of the United Nations and the Organization of American States to promote, separately but with a similar rationale, a new strategic approach to fighting corruption through the creation of two HACAS. Specifically, the book examines the International Commission Against Impunity in Guatemala (CICIG) and the Mission to Support the Fight against Corruption and Impunity in Honduras (MACCIH). The CICIG and the MACCIH represent unique cases of anti-corruption hybrid commissions because they combine resources, participants and/or national and international institutions which, in a coherent and integrated manner, strengthen the investigation, prosecution, and punishment of corrupt and criminal acts. The book also studies the HACAS as international instruments not free from risks and limitations.