The Bundesamt für Verfassungsschutz (BfV, "Federal Office for the Protection of the Constitution") is the Federal Republic of Germany's domestic intelligence agency. Its main function is the surveillance of anti-constitutional activities in Germany.
The Bundesamt für Verfassungsschutz with its headquarters at Cologne, is a federal institution under the control of the German Ministry of the Interior. 16 independent state based services (Landesämter für Verfassungsschutz, "State Offices for the Protection of the Constitution") exist in addition to this federal office.
Coordination between the different services and the parallelism of the state-based services is an ongoing problem. A merger into a single federal service has been topic of discussion, but the proposal faces strong political resistance due to the highly regarded principles of federalism.
The main job of the Verfassungsschutz is to observe organizations that are considered a threat to the "free and democratic basic order" (Freiheitlich-demokratische Grundordnung) of the Federal Republic of Germany. While they do use all kinds of surveillance technology and infiltration, most of their information is assembled from publications of the observed organisations. The information is compiled into yearly reports (Verfassungsschutzberichte) which are made available to the public; presumably there are more detailed, non-public reports given to the governments.
The organizations being currently observed by the Verfassungsschutz fall into the following groups:
Some of the Verfassungsschutz organisations have been given additional jobs by specific laws, such as the protection of government-related classified information, the monitoring of foreign secret services, or the monitoring of organised crime.