Locke High seeks to leave L.A. Unified Its teachers have signed petitions urging control be given to Green Dot charter schools. The loss would be a blow to the district and union. By Joel Rubin, Times Staff Writer May 10, 2007 Challenging the balance of power in the city's public school system, a leading charter school organization is poised to wrest control of a failing high school from the elected Los Angeles Board of Education. Green Dot Public Schools, which has clashed frequently with the board in its aggressive push to expand, has quietly overseen the collection of signatures of...