Written on January 16, 1872. Published in The Eastern Post, No. 173, January 20, 1872. Text of the newspaper, as transcribed by Tony Brown for the Marxists Internet Archive; one obvious transcription error corrected. Traducción al español.
Sir, — In The National Reformer of January 7th, Mr. Charles Bradlaugh says:
“We only meant to allege that Dr. Marx had, in former times, given information to his own Government.”
I simply declare that this is a calumny, as ridiculous as it is infamous. I call upon Mr. Bradlaugh to publish any fact that could afford him even the slightest pretext for his statement. For his personal tranquility I add that he shall not be “challenged.”
I am, Sir, yours obediently,
Karl Marx
January 16th