The Reich Security Main Office (RSHA) was a key agency in Nazi Germany, established in 1939. It was responsible for coordinating the various security and intelligence services, including the Gestapo and the SS. The RSHA played a crucial role in the enforcement of Nazi policies, including the persecution of Jews and other groups deemed undesirable. The RSHA was divided into several departments, each focusing on different aspects of security and intelligence. It operated under the leadership of Heinrich Himmler, who was also the head of the SS. The agency was instrumental in implementing the regime's oppressive measures during World War II.