Dissatisfied with long hours, churning turnover and, in some cases, lower pay than instructors at other public schools, an increasing number of teachers at charter schools are unionizing.
Labor organizing that began two years ago at seven charter schools in Florida has proliferated over the last year to at least a dozen more charters from Massachusetts and New York to California and Oregon.
Charter schools, which are publicly financed but managed by groups separate from school districts, have been a mainstay of the education reform movement and widely embraced by parents. Because most of the nation's 4,600 charter schools operate without unions, they have been freer to innovate, their advocates say, allowing them to lengthen the class day, dismiss underperforming teachers at will, and experiment with merit pay and other changes that are often banned by work rules governing traditional public schools.
"Charter schools have been too successful for the unions to ignore," said Elizabeth D. Purvis, executive director of the Chicago International Charter School, where teachers voted last month to unionize 3 of its 12 campuses.
President Obama has been especially assertive in championing charter schools. On Friday, he and the education secretary, Arne Duncan, announced a competition for $4.35 billion in federal financing for states that ease restrictions on charter schools and adopt some charter-like standards for other schools -- like linking teacher pay to student achievement.
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