The original sentence:
This tradition of guaranteeing anonymity began to develop quickly, although it was not until later that it was carried to the extreme of denying all knowledge of any individuals who were in its ranks and of refusing point blank to answer questions or to allow any outside contact with the legionnaires.
Three questions:
Does "point blank" modify "refusing", meaning directly?
Is "of refusing..." parallel to "of denying..."?
Is "to allow...” parallel to "to answer..."?