As the previous thoughts echoed, Hitler would be the answer to fit in the blank. Writing it while in prison, the book focused on how Hitler viewed the world as a struggle to prevent those who he deemed as "different" from possessing anything related to voice and acknowledgment. At the time of writing, it was not widely purchased, but as Hitler's Nazi Party began to gain prominence, the book became more widely read. In the absence of real leadership and stewardship under the Wiemar Government, Hitler and his cronies were able to gain political and social prominence, at which time the book became more widely absorbed as forming the backbone of Nazi believers.
The name that you need to put in this blank is Adolph Hitler. Hitler was, of course, the dictator of Germany during the time that the Nazi Party ruled that country.
Hitler had served as a soldier in WWI. After the end of that war, he was pretty unhappy with the way Germany was going so he joined the Nazi Party and soon rose to a position of power in that party. At that time, it was a very small party.
The party tried to overthrow the Germany government in 1923. For that, Hitler was imprisoned. While in prison, he started to compose Mein Kampf.
Adolph Hitler (1889-1945), who ruled Germany as a dictator from 1933 to 1945 wrote Mein Kampf. The title in German Language means My Struggle. The book was published in two volumes in 1925 and 1927. Hitler began writing this book when he was imprisoned in 1923.
In this book Hitler described his life and explained his political ideas. This included ideas like claims about superiority of German People above all other races in the world. He blamed Jews for the evils of the world. Also he supported Dictatorship over democratic rule. Mein Kampf was used by the Nazis as a sort of main reference book to guide them about Nazism.