Debs ran for president in the 1920 election while in prison in Atlanta, Georgia, at the Atlanta Federal Penitentiary. He received 919,799 votes (3.4%), slightly less than he had won in 1912, when he received 6%, the highest number of votes for a Socialist Party presidential candidate in the United States. During his time in prison, Debs wrote a series of columns deeply critical of the prison system. They appeared in sanitized form in the Bell Syndicate and were published in his only book, "Walls and Bars", with several added chapters. It was published posthumously.