Fluent speakers of English, please could you help me with my English?

I am reading a rather complex book about architecture and social issues and find it difficult to understand some phrases. What the word "cautiously" mean in this context (does it mean he made sure he is definitely a fascist because he had close ties with the left wing of the fascist movement or does it mean he remained cautious (meaning moderate) fascinst as he was inclinded more to the left? or neither?):

As a protege of Georges Sorel, Hubert Lagardelle had close ties with the left wing of the Italian Fascist movement and as such was cautiously pro-Fascist.