However, Winzer also carried out activities beyond his theoretical functions. For example, he cooperated with other embassy officials on plans to build a German oil refinery at Santa Cruz de Tenerife (in Canary Islands) with a view to using it in a future war; he was also responsible for the formation of the new political police ("politico-social brigade") of the Franco regime. After the signing of a police cooperation agreement between Franco's Spain and Germany in 1938 (which established the mutual extradition of "political criminals" arrested in both countries), Winzer's power in Spain increased considerably. After the end of the civil war, a later agreement further strengthened his power, and also allowed the installation in Spain of a network of "Sicherheitsdienst" (SD) agents under the supervision of Winzer himself. The network under his supervision consisted of around 30 agents who were spread across the entire Iberian Peninsula . 