Do Christians need to be socialists? Karl Barth and socialism. In this article, the author deals with a “shadow side” of the life and work of Karl Barth. From the perspective of many Eastern and Central European people who have experienced “real” socialism, the right to ask the question posed in the title is evident. It examines under what influences Karl Barth’s inclination towards social democracy and socialism arose. Three circumstances are mentioned: 1. The traditional Swiss solidarity and social sensitivity for the cause of the weak and oppressed.