Marx-Engels Correspondence 1870
Source: Karl Marx, Letters to Dr Kugelmann (Martin Lawrence, London, undated). Scanned and prepared for the Marxist Internet Archive by Paul Flewers.
As I have an abscess on the right thigh which makes sitting for any length of time impossible, I am sending you the enclosed letter  for the Brunswick Comité,  Bracke  and Co, instead of writing twice. It would be best if, after reading it through, you could hand the letter over personally and remind them again that the information is confidential, not intended for the public.
1. ‘Confidential Communication on Bakunin’.
2. Committee – Marx-Engels-Lenin Institute.
3. Wilhelm Bracke (1842-1880) – Active member of the German Social-Democratic movement. At first a Lassallean, later an Eisenacher. Stood close to Marx – Marx-Engels-Lenin Institute.