The largest single protest Agree_or_refuse_to_act occurred Presence on March 25 , 2006 in downtown Los Angeles with an official estimate of more than 500,000 people marching Self_motion in what organizers called `` La Gran Marcha '' ( `` The Great March '' ) .

Organizers of La Gran Marcha , however , state Statement that the actual revised Change number of participants Participation is somewhere between 1.25 and 1.5 million estimated Cause_change_of_position_on_a_scale through later photographic analysis Research .