This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
The League's membership reached a documented peak of 5.67 million in 1931, well short of its own 17 million target, and fell to about 2 million by 1938 during the worst of the Great Terror before recovering to around 3.5 million by 1941; nearly half its membership was concentrated in the Moscow and Leningrad metropolitan areas, and it ran roughly 96,000 local offices across the Union by that final year. Its publishing arm grew at a comparable scale: by 1932 it produced ten anti-religious newspapers, including Bezbozhnik and Bezbozhnik u Stanka, and twenty three anti-religious magazines, among them Antireligioznik, Ateist and Voinstvuiuschii Ateizm, and its non-serial literature output grew from about 12 million printed pages in 1927 to some 800 million by 1930.
Public activity ended in 1941 as Stalin eased religious policy to widen domestic and Allied support for the war effort, and most of the League's periodicals ceased publication that year; the organization was formally dissolved in 1947 and never revived, its own collapse tracking almost exactly the wartime reversal of the state policy that had created it.