mexico city powerful former leader mexico large teacher union elba esther gordillo let jail house arrest four years detention embezzlement charge government judicial source say friday gordillo 72 unexpectedly arrest 2013 first year president enrique pena nieto government appear show rule institutional revolutionary party pri take stand corruption attorney general pgr week stop fight gordillo lawyer attempt get prison tribunal approve say source speak condition anonymity judicial source say matter hours days would allow go home decision let gordillo see trial house arrest come political party found new political alliance party panal say would back pri 2018 election powerful mexico former union boss grant house arrest