What was the code name of Germany's invasion of the Soviet Union during 1941?

The code name was Operation Barbarossa. 

Key Facts of the Invasion

• The Date: Nazi Germany launched the invasion on June 22, 1941.
• The Scale: It remains the largest military operation in human history.
• The Goal: Adolf Hitler sought to conquer the western Soviet Union for living space (Lebensraum).
• The Turning Point: Despite early German victories, Soviet resistance and the harsh winter caused the invasion to ultimately fail.