Following the detention of their brothers Alejandro, Héctor and Antonio in August 2001, Francisco and Emiliana Cerezo Contreras formed the Cerezo Committee to campaign for their release.

They have been victims of various episodes of harassment and threats, and PBI has accompanied them and other members of the Cerezo Committee since February 2002.

Alejandro Cerezo was exonerated of all charges and freed from prison in March 2005. On February 16th, 2009, Héctor and Anotonio Cerezo were freed from prison after completing their sentence.

The Committee continues to work for the rights of political prisoners in Mexico. Its work includes documenting the cases of human rights defenders criminalised and imprisoned because of their human rights activities, supporting those imprisoned, campaigning on prison conditions and running human rights and security workshops for human rights defenders and organisations.