Authors:

I had relatives in New York City who I stayed with. And in those days, the area from Union Square down Fourth Avenue had small bookstores, many of which were run by Spanish immigrants who'd fled after [Francisco] Franco's victory. I spent time in them, and also in the offices of Freie Arbeiter Stimme (Free Worker's Voice) with anarchists. I picked up a lot of material and talked to people, and it became a major influence.

Source: thehumanist.com
I had relatives in New York City who I stayed with. And in those days, the area from Union Square down Fourth Avenue had small bookstores, many of which were run by Spanish immigrants who'd fled after [Francisco]