What is bezbozhnik?

Some articles on bezbozhnik:

League Of Militant Atheists - Activities
... The weekly Bezbozhnik reached 500,000 copies per issue in 1931 ... The monthly Bezbozhnik, grew from 28,000 in 1928 to 200,000 in 1931, dropped to 150,000 after 1932, climbed to 230,000 in 1938 and went down 155,000 in 1939 ... The Bezbozhnik u stanka consistently ran 50,000-70,000 copies per issue, however, it changed from a monthly to a fortnightly in 1929 and continued to produce until it was closed in 1932 ...