Lawmakers have escalated their probe of three nonprofits linked to Marxist tech tycoon Neville Roy Singham's funding network, warning that their leaders — and even Singham himself — could be hauled before Congress to answer questions under oath unless they comply with subpoenas by Tuesday.In new letters announced this week, the Republican-led House Ways and Means Committee renewed its demands for financial records and other documents as lawmakers investigate whether millions of dollars flowing t
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