"[Discovering Imperialism] provides major texts from writers in the socialist camp that are very germane to reflection on the nature of the conflict that exploded in 1914, and they are accompanied by an excellent extended introduction from the two editors, Richard B. Day and Daniel Gaido." – R.J.W. Evans, in: The New York Times Review of Books

“[T]his is a really excellent book, which is deeply informative about the development of Marxist ideas about imperialism before Lenin’s famous text… [It] should be as widely read on the left as possible. It opens up a vista of a much more complex debate and development than our ‘traditional’ left narratives of the issue allow us to see.” - Mike Macnair, The Weekly Worker

"Richard B. Day and Daniel Gaido have performed a tremendous service by making available for the first time in Rnglish fifty-five articles documenting the debates among socialists (primarily, but not exclusively, within the German socialist movement) with respect to imperialism in the decade and a half leading up to World War I." - International Socialist Review