The International Institute of Social History in Amsterdam has a set of portraits of exiled Russian anarchists from the Fléchine (Senya Fleshin) collection. (And an exiled Italian anarchist, Ghezzi.)

Details of the Fléchine collection are here:
http://search.iisg.nl/search/search?action=transform&col=archives&xsl=archives-detail.xsl〈=en&docid=10748542_EAD

Details of the collection of portraits are here:
http://search.iisg.nl/search/search?action=transform&col=marc_images&xsl=marc_images-detail.xsl〈=en&docid=10756623_MARC

These photos are housed at the International Institute of Social History, and they'd like a copy of any print publications they appear in (for their library). The initial identification work was done by the Kate Sharpley Library.