I want to know the answer to the following question:
What political doctrine interested Popper in 1919?
All the background I'm provided with is that "After the street battle in the Hörlgasse on 15 June 1919, when police shot eight of his unarmed party comrades, he became disillusioned by what he saw to be the "pseudo-scientific" historical materialism of Marx, abandoned the ideology, and remained a supporter of social liberalism throughout his life.". Is that enough to answer the question?
Answer: no