On the deep studying of manuscript sources, the authors described anti-feudal heretic movements in Russia of the fourteenth — early sixteenth centuries: movements of Strigolniki, and the so called ‘Judaizantes’. According the Soviet tradition the author interpreted those heresies as anti-feudal manifestations and something close to the Reformation and Humanism at once.

However, for the first time in the historiography, they gave a documentary survey of the heretic movements in Russia. The book unites two parts. The first one belong to K.; it is called ‘The Novgorod and Pskov Heresy of Strigolniki in the Fourteenth — Fifteenth Centuries’. The second part was written by L.: ‘The Novgorod and Moscow Heresy of the Late Fifteenth — Early Sixteenth Centuries’. The Appendix contains narrative texts and documents in those heresies, which had not been published before; they were prepared for publication by A.A. Zimin, A.I. Klibanov, Ya. S. Lurie, N.A. Sokolov.

The work was done in the frames of the research plan of the Museum for the History of Religion and Atheism of the Ac. of Sc. of the U.S.S.R.