423. Introductory Letter to Letters from Russian Prisons [Einstein 1925s] Dated ca. 16 January 1925 Published after 29 July 1925 In: Letters from Russian Prisons, Consisting of Reprints of Documents by Political Prisoners in Soviet Prisons, Prison Camps and Exile, and Reprints of Affidavits Concerning Political Persecution in Soviet Russia, Official Statements by Soviet Authorities, Excerpts from Soviet Laws Pertaining to Civil Liberties, and Other Documents. With Introductory Letters by Twenty-Two Well-Known European and American Authors [Alexander Berkman, ed.]. Published for The International Committee for Political Prisoners. New York: A. & C. Boni, 1925, p. 7.