This collection is made up of articles that appeared in print earlier at different times. It is based on the collection "In Memory of Karl Marx," published in 1918 under the editorship of G. Zinoviev. From the articles of that collection, only a chapter from Mehring's book "Karl Marx - the story of his life" is not printed here, in view of the fact that at present this book has appeared entirely in Russian translation (State Publishing House. Petersburg, 1920) and should be published in a short time by a new edition.