Maximoff’s The Guillotine at Work is an essential source for looking at the history of the Russian anarchist movement after 1917. It was originally published by the The Chicago section of the Alexander Berkman Fund in 1940. The first half, which comprises the argument against Leninism, was reprinted by Cienfuegos Press (1979). Now a PDF of the second part of the book (documents about the repression of the anarchist movement) is freely available at libcom.org. You can get this essential primary source on Russian anarchism at: http://libcom.org/library/guillotine-work-part-2-data-documents
Read it and remember!