Geodesic
Nonfree actions of countable groups and their characters
Zapiski Nauchnykh Seminarov POMI, Representation theory, dynamical systems, combinatorial methods. Part XVIII, Tome 378 (2010), pp. 5-16

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We introduce a number of definitions of nonfree actions of groups. The most important of them is that of a totally nonfree action; it is naturally related to the theory of characters of groups and their factor representations. This short note is a brief exposition of a part of a more detailed paper on this subject, which is now in preparation. Bibl. 8 titles. 
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     author = {A. M. Vershik},
     title = {Nonfree actions of countable groups and their characters},
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     url = {http://geodesic.mathdoc.fr/item/ZNSL_2010_378_a0/}
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A. M. Vershik. Nonfree actions of countable groups and their characters. Zapiski Nauchnykh Seminarov POMI, Representation theory, dynamical systems, combinatorial methods. Part XVIII, Tome 378 (2010), pp. 5-16. http://geodesic.mathdoc.fr/item/ZNSL_2010_378_a0/