In Berlin, he insinuated himself into the Nazi Party and read Nazi propaganda, particularly Adolf Hitler's "Mein Kampf". Sorge attended so many beer halls with his new acquaintances that he gave up drinking to avoid saying anything inappropriate. His abstinence from drinking did not make his Nazi companions suspicious. It was an example of his devotion to and absorption in his mission, as he had been a heavy drinker. He later explained to Hede Massing, "That was the bravest thing I ever did. Never will I be able to drink enough to make up for this time". Later, his drinking came to undermine his work.