 Given the inefficiency of this one, committees of "vigilantes" are created in the years 1820–1830.In 1836, the city was divided into three separate municipalities, each with an autonomous police force..In July 1866 Republicans called for a Louisiana Constitutional Convention at the Mechanics Institute in New Orleans, as they were angered by the legislature's passage of Black Codes and failure to provide suffrage for free men of color and freedmen.