Gustav Eckstein (1875–1916) was an Austrian social democrat, and associate of Karl Kautsky.
[1] Eckstein is usually remembered today for playing a role in communism.
Dr. Otto Steiger writes that: I think that this person could be Gustav Eckstein (1875–1916), socialist (marxian revisionist) and economist.
For a broader public he is known as a critic of Rosa Luxemburg's Die Akkumulation des Kapitals.
His review of this book has been printed as an appendix in all German editions of Die Akkumulation after Luxembourg's death.