Soon after, the CNT also joined the national government. On 18 October, a CNT plenary session of the regional federations granted the national committee secretary Horacio Martínez Prieto full powers to conduct negotiations with prime minister Francisco Largo Caballero. CNT representatives Juan García Oliver, Joan Peiró, Federica Montseny and Juan López filled seats in Caballero's cabinet. They took control of the national ministry of justice, industry, health and commerce, respectively. The CNT saw this "maximum concession compatible with its antiauthoritarian spirit" as crucial to winning the war. There was widespread friction and debate between the "collaborationist" and "abstentionist" anarchists in the CNT. Many anarchists outside of Spain (such as Alexander Schapiro) criticized CNT-FAI for entering into the government. There was also concern among anarchists with the growing power of Marxist communists within the government. Anarchist Minister of Health Federica Montseny later explained: "At that time we only saw the reality of the situation created for us: the communists in the government and ourselves outside, the manifold possibilities, and all our achievements endangered."