La Paz, Bolivia: n.pub. 1966. 28p., very good in wraps; rubberstamp on title page indicating this copy was distributed by the government.
Barrientes, who came to power in a CIA-backed coup, tried to undermine the popularity of Che Guevara's movement among workers by co-opting unions. "Con los obreros, sí; con los demagogos, no." It was under his administration that Che was captured and killed in the following year.