In 1881, the Tucson City Directory published the following about the Barrio Libre Neighborhood. However, I got a somewhat different take on it when I was there.
"This designation was given by the Mexican residents to that quarter of the city lying among Meyer and adjacent streets, southward of the business portion of the city occupied by the Americans. It means Free Zone, and in earlier times was allowed to remain without legal restraints or the presence of a policeman. Here, the Mescalian could imbibe his fill, and either male or female could, in peaceful intoxication, sleep on the sidewalk or in the middle of the streets, with all their ancient rights respected. Fandangoes, monte, chicken fights, broils, and all the amusements of the lower class of Mexicans were, in this quarter, indulged in without restraint; and to this day much of the old-time regime prevails, although the encroachments of the American element indicate the ultimate doom of the customs in the Barrio Libre. It must be understood that these remarks apply only to the lower class of Mexicans and not to the cultured Mexican residents of the city, who, for intelligence and enterprise, are foremost among our people." (1881)