Carlo Cafiero ( September 1 , 1846 - July 17 , 1892 ) was an Italian anarchist and friend of Mikhail Bakunin during the second half of the 19th century . Carlo Cafiero ( September 1 , 1846 â `` July 17 , 1892 ) was an Italian anarchist and champion of Mikhail Bakunin during the second half of the 19th century .