stuartw2112 :
Thirteen years ago you did not see fit to reply to this post of mine: https://groups.yahoo.com/neo/groups/WSM_Forum/conversations/messages/2308 .
I think of this often. This morning I did something about it, searching for the supposed quote again, and, this time, finding it: here, in a newspaper from 1962:http://news.google.com/newspapers?nid=348&dat=19620212&id=OucuAAAAIBAJ&sjid=aTEDAAAAIBAJ&pg=3294,1665265 .
So, it seems that the would-be Kropotkin quote about Marx was a product of the imagination of the journalist Sokolsky ( http://en.wikipedia.org/wiki/George_Sokolsky ) . Now the mystery is: whence the shameless attribution 'memoirs p.320'? That does not come from George Sokolsky. And of course there is nothing of the sort on page 320 of Kropotkin's memoirs or on any other page in that book.