With its growing financial strength, the CTA gained the ability to shape public opinion. In 1996, for instance, the union—casting covetous eyes on surplus tax revenues from the state’s economic boom—spent $1 million on an ad campaign advocating smaller classes. Californians began seeing the state’s classrooms as overcrowded, according to polls. So Governor Pete Wilson earmarked some three-quarters of a billion dollars annually to cut class sizes in kindergarten through third grade. The move produced no discernible improvements in student performance, but it did require a hiring spree that inflated CTA rolls and produced a teacher shortage. (The union drew the line, however, when it faced the threat of increased accountability. Two years later, when Wilson offered funds to reduce class sizes even more but attached the money to new oversight mechanisms, the CTA spent $6 million to defeat the measure, living up to Wilson’s assessment of it as a “relentless political machine.”)
During this contentious period, the CTA and its local affiliates learned to play hardball, frequently shutting down classes with strikes. The state estimated that in 1989 alone, these strikes cost California students collectively some 7.2 million classroom days. Los Angeles teachers provoked outrage that year by reportedly urging their students to support them by skipping school.
The Beholden State by Steven Malanga, City Journal Spring 2010
The whole article is well worth a read. Be wary of big labor, they are evil.