The most powerful woman in Mexico has gone from patron of presidents to prison cell.<br /><br />Union leader Elba Esther Gordillo, known simply as "The Teacher", has been charged of of stealing up to $200m and links to organised crime.<br /><br />A day before the arrest, President Enrique Pena Nieto signed into law new reforms that would break the union’s grip on Mexico’s schools.<br /><br />That move has left some asking if the charges were timed to stop Gordillo from mobilizsng members to overturn the new policies.<br /><br />Al Jazeera's John Hendren reports from Mexico City.