Introduction. Addressing the complex and controversial problem of domestic Cossack studies – the determination of the stage affiliation of early Slavic Cossack communities – the author sets himself the task of summing up many years of discussions, identifying the most promising directions for further research, and identifying the associated methodological guidelines. Methods and materials. Many studies of the problem of the stage affiliation of early Cossack communities, carried out by pre-revolutionary, Soviet, and modern Russian Cossack researchers, as well as works on male unions and communities of the Slavic, Caucasian, and Turkic worlds, served as materials for the article. The analysis of sources and scientific publications was carried out using comparative historical and structural-functional methods, as well as methods of classification and typologization. Analysis. The available scientific papers on the problem were classified based on the social and political prototypes of early Cossack communities determined by scientists. Three groups of versions about the social nature of early Cossack communities have been identified, which correlate them: 1) with state structures; 2) with paramilitary communities that existed in the South Russian steppes and adjacent territories at the same time as the Cossacks; 3) with archaic structures (the so-called military democracy and male unions). Results. Defining the third direction as the most promising, the author of the article suggests expanding research on the cultural and historical comparison of Cossack organizations with archaic male unions and their later forms known in the Turkic, Caucasian, and Slavic worlds. We should start this case by adhering to a set of crucial methodological principles. These principles indicate that male unions were cultural universals, and their correlation with Cossack organizations may indicate not so much (and not only) genetic connections as typological ones. In contrast to the Caucasian and Central Asian unions, Cossack communities arose outside the metropolis, which, on the one hand, led to the need for them to build their own potestar structures and, on the other hand, determined the strong external impact on them from the Russian state. The development of Cossack communities did not follow the path of evolution but was first carried out in the form of a rollback to the archaic and then was associated with a series of sociocultural transformations.