Step 1: Understanding the historical context.
In 1933, Adolf Hitler's party, known for its fascist ideology and led by Hitler, came to power in Germany. This party played a significant role in the events leading to World War II.
Step 2: Analyzing the options.
(A) Labour Party: The Labour Party is a political party associated with social democracy, not Nazi ideology.
(B) Nazi Party: Correct — The party that Hitler led was the National Socialist German Workers' Party, commonly known as the Nazi Party.
(C) Ku-Klux-Klan: This is a racist, hate-based organization in the United States, not related to Hitler's party.
(D) Democratic Party: The Democratic Party is a political party in the United States, unrelated to Hitler's regime.
Step 3: Conclusion.
The correct answer is (B) Nazi Party, as this is the party that Hitler led to power in 1933.