The Reichskonkordat is the most controversial of several concordats that the Vatican negotiated during the pontificate of Pius XI. It is frequently discussed in works that deal with the rise of Hitler in the early 1930s and the Holocaust. The concordat has been described by some as giving moral legitimacy to the Nazi regime soon after Hitler had acquired quasi-dictatorial powers through the Enabling Act of 1933, an Act itself facilitated through the support of the Catholic Centre Party.