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).

NoteThe claim lists four specific funding sources with amounts. The source confirms all four: (1) Open Philanthropy is documented ($400K in 2018, though for Immigration not unspecified operations); (2) Hewlett Foundation's $400K operations grant in 2018 is confirmed; (3) Linden Trust for Conservation is confirmed with multiple grants including $200K in 2016; (4) The 501(c)(4) arm's Open Society Foundations $500K in 2017 and Democracy Fund Voice $175K in 2018 are both confirmed. However, the claim says 'Open Philanthropy' as a key donor without specifying the year/amount, while the source shows $400K in 2018 for a specific program. The claim's phrasing 'Key donors include' suggests these are among major donors, which is supported by the source's comprehensive donor tables. All specific dollar amounts and years mentioned in the claim are verified in the source.