Mr Baron arrived in Bolivia on the advice of his friend, the French anarchist writer Gaston Leval.
"I asked him for a sparsely populated place, without services like water and electricity, where people lived like 100 years ago - because where you have civilisation you'll find priests."
Some 400 people, mostly Guarani Indians, lived there at the time, but in fact also a German priest.
"He was a tough nut to crack. He learnt of my arrival and told everyone that I was a criminal. They fled and made the sign of the cross whenever they saw me, but two months later I started speaking and they realised I was a good person, so it backfired on him."
Read More | "Meeting Spain's Last Anarchist" | Alfonso Daniels | BBC