Original: Hitler : a study in Tyranny by Alan Bullock On March 24 , 1919 , Karl Harrer ( a sports journalist and member of the Thule Society ) joined the DAP to increase the influence of the Thule Society over the DAP 's activities , and the party name was changed to the '' Political Workers ' Circle '' .
Simplified: Hitler : a study in Tyranny by Alan Bullock On 24 March 1919 , Karl Harrer ( a sports journalist and member of the Thule Society ) joined the DAP to try to get more control over the DAP for the Thule Society .