Niskanen Center — funding-sources: Key donors include Open Philanthropy, Hewlett Foundation ($400K operations grant), Linden Trust for Conservation. The 501(c)(4) arm received funding from Open Society Foundations ($500K in 2017), Democracy Fund Voice ($175K in 2018).

Note: The provided source excerpt from InfluenceWatch contains general information about the Niskanen Center (its formation, leadership, activities, controversies) and financial data from 2019 (Revenue: $6,548,833; Expenses: $4,421,324; Assets: $3,106,098), but does not discuss or list any specific funding sources or donors. The claim provides detailed information about key donors and specific grant amounts, none of which are mentioned in the source text. Since the source does not address these specific funding details, the claim cannot be verified against this source.