Much of the ideology of the Ustaše was based on Nazi racial theory. Like the Nazis, the Ustaše deemed Jews, Romani, and Slavs to be sub-humans (Untermenschen). They endorsed the claims from German racial theorists that Croats were not Slavs but a Germanic race. Their genocides against Serbs, against the Jews, and against the Romani were thus expressions of Nazi racial ideology. However, the Ustaše viewed the Bosniaks as "Muslim Croats," not Slavs, and as a result did not persecute Muslim Bosniaks on the basis of race.