Local civilians in El Alto, Bolivia, detained three Cuban nationals and handed them over to police on Wednesday, who found evidence that the foreigners were paying people to riot on behalf of the nation’s socialist party. The revelation follows the arrests of several Venezuelan and Cuban citizens among the thousands rioting in El Alto and La Paz, the seat of the executive branch, and the positive identification of a man injured during protests two weeks ago as an Argentine member of the Marxist Revolutionary Armed Forces of Colombia (FARC) terrorist group. Members of anti-socialist groups who organized peaceful protests against...