Which action of Hitler was a direct violation of the Treaty of Versailles?

These violations include:

Banning political parties including the Communist Party and imprisoning political rivals in concentration campsReintroducing Military Conscription to all branches of the German Armed Forces in 1935Engaging in massive rearmament projects starting in 1935; Companies such as Krupp and Heinkel, as well as several industries, developed innovative techniques to streamline production of military equipment and diversify their capabilitiesSetting up several covert organizations such as the Deutsche Verkehrsfliegerschule, a flight school, to train future Luftwaffe pilots under the guise of civilian trainingParticipating in expeditionary activities; During the Spanish Civil War, the Condor Legion tested several bombing techniques with an emphasis on dive bombing to test their effectiveness and gain some experience for their forcesRemilitarizing the Rhineland in 1936 Annexing Austria, dubbed "Anschluss" Annexing the Sudetenland from Czechoslovakia and eventually Czechoslovakia itselfFailing to pay the remainder of its reparations once the German Economy took off in the mid to late 1930sMoving full force into developing the Luftwaffe, violating a major provision of the Treaty which denied Germany any air force at all Heavily expanding the Kriegsmarine with the construction of a new and enhanced U-Boat Fleet as well as violating several limits put forth on the Kriegsmarine