Hi Margo -- thanks for posting on History Hub!
Ed Sullivan's testimony is available in the published hearing transcript titled Employment Practices in the Performing Arts -- see page 33. The hearing was held before the Committee on Education and Labor of the U.S. House of Representatives, part of a series of hearings held on October 29-31 and November 1-2, 1962. The hearing transcript is available online through Hathi Trust.
It's possible supplemental material on the hearing or on the investigation on discrimination practices in the performing arts is with the committee papers of the Committee on Education and Labor in the 87th Congress.
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