In her 1917 coverage of the Russian Revolution, Bryant wrote about Russian leaders such as Katherine Breshkovsky, Maria Spiridonova, Alexander Kerensky, Vladimir Lenin, and Leon Trotsky. Her news stories, distributed by Hearst during and after her trips to Petrograd and Moscow, appeared in newspapers across the United States and Canada in the years immediately following World War I. A collection of articles from her first trip was published in 1918 as Six Red Months in Russia.

Over the next year, she defended the revolution in testimony before the Overman Committee, a Senate subcommittee established in September 1918 to investigate foreign influence in the United States. Later in 1919, she undertook a nationwide speaking tour to encourage public support for the Bolsheviks and to denounce armed U.S. intervention in Russia.

After Reed's death from typhus in 1920, Bryant continued to write for Hearst about Russia, as well as Turkey, Hungary, Greece, Italy, and other countries in Europe and the Middle East. Some articles from this period were collected in 1923 under the title Mirrors of Moscow.