 For many years the prison was administered by the Secretariat of the Interior.Over the years the prison population has fluctuated from 300 to 3000 prisoners.In addition to prisoners, on Maria Madre island, there are employees of diverse institutions of the federal government, such as the Secretariat of Public Education, the Secretariat of the Environment, the Secretariat of Communications and Transport, Post Offices, and the Secretariat of the Navy.