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The Constitution Protection Office[1] (Hungarian: Alkotmányvédelmi Hivatal, "AH") 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).
AH is active since 2010.