Carlos Kauffmann, 35, was one of five men accused of acting on behalf of Venezuela's anti-U.S. government in a case that touched off corruption allegations in Argentina and diplomatic tensions between the Washington, Caracas and Buenos Aires.

Kauffmann entered a guilty plea on Friday to a charge of conspiring to act as an agent of Venezuela without registering with the U.S. government and could face five years in prison. He agreed to cooperate with prosecutors, according to a plea agreement released by the U.S. Attorney's Office in Miami.