Conversation so far:
What were August Strindberg's political views?
August Stridberg was a socialist.
Did August Strindberg write about his views?
Many of August Strindberg's works had at least some politics and sometimes an abundance of it.
Did August Strindberg talk about his political views?
August Strindberg had many opinions he spoke about.
How was August Strindberg an anarchist?
August Strindberg was more of an anarchist, meaning he was a libertarian socialist, which he himself claimed on at least one occasion.
Was there controversy over August Strindberg's politics?
During other periods August Strindberg had strongly misogynistic opinions, calling for lawmakers to reconsider the emancipation of these half-apes ... mad ... criminal, instinctively evil animals.“
How did these groups respond to August Strindberg?
Did August Strindberg back any particular politicians?

Question: What other causes did he get behind?
Self-contained rewrite: What other cause did August Strindberg get behind?