Rosas even resigned as commander of militias to influence the legislature. The context changed with the social commotion generated by the death of Facundo Quiroga, responsibility for which is disputed (different authors attribute it to Estanislao López, the Reinafé brothers, or Rosas himself). The legislature accepted then to give him the sum of public power. Even so, Rosas requested confirmation on whenever the people agreed with it, so the legislature organized a referendum about it. Every free man within the age of majority living in the city was allowed to vote for "Yes" or "No": 9.316 votes supported the release of the sum of public power on Rosas, and only 4 rejected it. There are divided opinions on the topic: Domingo Faustino Sarmiento compared Rosas with historical dictators, while José de San Martín considered that the situation in the country was so chaotic that a strong authority was needed to create order. Although slavery was not abolished during Rosas' rule, Afro Argentines had a positive image of him. He allowed them to gather in groups related to their African origin, and financed their activities. Troop formations included many of them, because joining the army was one of the ways to become a free negro, and in many cases slave owners were forced to release them to strengthen the armies. There was an army made specifically of free negros, the "Fourth Battalion of Active Militia". The liberal policy towards slaves generated controversy with neighbouring Brazil, because fugitive Brazilian slaves saw Argentina as a safe haven: they were recognized as free men at the moment they crossed the Argentine borders, and by joining the armies they were protected from persecution of their former masters. The people who opposed Rosas formed a group called "Asociacion de Mayo" or May Brotherhood. It was a literary group that became politically active and aimed at exposing Rosas' actions. Some of the literature against him includes "The Slaughter House", "Socialist Dogma", "Amalia" and "Facundo". Meetings which had high attendance at first soon had few members attending out of fear of prosecution. Rosas' opponents during his rule were dissidents, such as José María Paz, Salvador M. del Carril, Juan Bautista Alberdi, Esteban Echeverria, Bartolomé Mitre and Domingo Faustino Sarmiento. Rosas political opponents were exiled to other countries, such as Uruguay and Chile. The 17 years long rule of Rosas was influenced by permanent warfare, both from unitarians and by other countries.