From utla.net/aboutus/index.php:
United Teachers Los Angeles (UTLA) was created in 1970 from more than a dozen different organizations representing teachers and support service personnel throughout the massive Los Angeles Unified School District (LAUSD). A merger of the two major rival groups, American Federation of Teachers Local #1021 and the Association of Classroom Teachers of Los Angeles in that year succeeded in bringing all non-administrative, certificated personnel under the one banner of UTLA and its affiliates, the California Teachers Association (CTA), the National Education Association (NEA), and the American Federal of Teachers, AFL CIO.