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Tough spot. 501(c)(6) organizations are not charities, so they are not required to disclose contributor information publicly. Your best bet is to formally request their Form 990, as the IRS requires that to be available for inspection. If they still refuse, you can file a complaint with the IRS.
On the verification front, the Nonprofit Check Plus API is a game changer. It lets you instantly verify any nonprofit’s compliance status by pulling real-time data directly from the IRS and OFAC. This API automates the due diligence process, making donor platforms and grantmaking workflows more transparent and trustworthy.