For the sake of the conspiracy of the couplet:
Six years out:
Brademas, S. J. "Revolution and Social Revolution: A Contribution to
the History of the Anarcho-Syndicalist Movement in Spain, 1930-1937."
D. Phil., Oxford, 1953-1954.
Perhaps Brademas wasn't the first future senator to research the CNT
in such detail.
It's a good read if you can get your hands on it.