1933, the Nazi party won the German election and Hitler came to power. He soon began to implement his autocratic policy, banned all political parties except the Nazis, practiced the Nazi one-party dictatorship, abolished the black, red and Huang San flags, and took the swastika flag as the national flag of Germany:

1The Imperial Flag Law promulgated on September 5, 935 stipulates that from now on, the German flag can only be a swastika (with a left hand swastika), and the black and white red tricolor flag can no longer be used as the national flag. Hermann G?ring, chairman of the National Assembly, explained the reason for this change in a talk in Nuremberg: "The old national flag (referring to the black-white-red tricolor flag) is full of honor, but it only represents the past honor of Germany. Our respect for the ancient black and white red tricolor flag has hindered our attention to the reactionary significance of this flag under the symbol of victory. "

A recognized reason for banning the use of black, white, red and tricolor flags is the Bremen incident in new york on July 26th. 1935: When the German liner Bremen docked at new york Port, a group of participants in the "anti-Nazi March" climbed into Bremen, tore the swastika flag into pieces and threw it into the Hudson River. Four days later, the German ambassador submitted a strongly worded protest letter to the US government, which pointed out that the German flag had been "humiliated". The United States, on the other hand, shirked its responsibility on the grounds that the swastika flag was only the flag of the Nazi Party, while the black, white and red tricolor flag as the German flag was not damaged. This incident finally made Hitler decide to amend the national flag law.