However so far the Constitutional court has only used this power twice , outlawing the KPD ( Communist Party of Germany ) and the SRP ( Socialist Reich Party , a successor to the NSDAP ) because both parties ideas went against the constitution . However , so far the Constitutional court has only used this power twice , outlawing the SRP ( Socialist Reichs Party , a successor to the NSDAP ) in 1952 , and the KPD ( Communist Party of Germany ) in 1956 .