{London,] 14 June 1876 

Dear Friend, 

Engels will already have informed you that Liebknecht and his 
friends have reason to regard Richter as under suspicion—of 
spying. If this were to be confirmed, it would also explain why 
my address book—containing the addresses of my correspondents 
in various countries—should have disappeared after the last visit 
which Richter deigned to pay me. The grave disquiet this business 
is causing me is solely on account of a few people in Russia. 

Pio should be warned as well. 

Yours ever, 

K. Marx