One of the leading Marxist political theorists and economic reform advocates during the period of the Russian Revolution (1871 - 1919). ALS in German, signed “Rosa L.,” one page both sides, 5.25 x 4.25, Neue Zeit letterhead, April 12, 1907. Postscript on an autograph postcard by the socialist Luise Kautsky (1864 - 1944). Both ladies extend their condolences to the widow of the social democratic politician Ignaz Auer, who had just passed away at the age of 61. Luxemburg writes, in part (translated): "I cordially shake your hand at this sorrowful hour. You know how deeply I admired your husband; I am quite unable to adjust to the thought that we shall no more see this splendid figure among ourselves, and it is with pain that I remember those few moments when I beheld his unforgettable face with that wonderful expression in his eyes. I feel that we have been suddenly impoverished and that it has become cold all around us." In fine condition, with two file holes to the left edge.Format: ALS