José Daniel Ferrer García, Cuban opposition leader and former Amnesty International prisoner of conscience, has been in detention for 40 days, since Oct 1, for reasons still unknown. As far as we can ascertain, he has not been informed of the charges against him or brought before a judge. In addition, recent alarming reports suggest he may have been tortured or ill-treated while in detention, something Amnesty International has not been able to independently verify in a context where lawyers and the judiciary are largely controlled by the Executive. Mass mobilization is needed to ensure that the Cuban government presents charges against him or release him, and refrains from potentially taking actions that may amount to ill-treatment against him.