What does the acronym CIO stand for in the following context?
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“At the time of her arrest, Rosa Parks was Secretary of the Montgomery local of the NAACP, a branch that had deep roots in the city’s trade union movement. A few years earlier, as an advisor to the local’s Youth Council, she helped young African-Americans organize a campaign to borrow books from whites-only libraries. And just months before the boycott she spent time at the Highlander Folk School– a legendary leftist organizing academy supported by and influential in the growth of the CIO – as part of a program on how to organize in the climate fostered by the Supreme Court’s 1954 Brown v. Board of Educationdecision. Suffice it to say she wasno novicewhen she held her ground on the bus.”