The Constitution Protection Office (Hungarian: "Alkotmányvédelmi Hivatal", <abbr>"AH"</abbr>) is a Hungarian internal security intelligence agency, formerly known as Nemzetbiztonsági Hivatal (en. Office of National Security). Its primary responsibilities are: counterintelligence, anticorruption, economic security and related proactive measures. The AH also leads investigations against organized crime and deals with (mainly internal) threats against society (such as subversion).