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Billionaires David and Julia Koch were best known as dark-money mega-donors to conservative causes and candidates, but they also gave tens of millions of dollars to charity each year. Since David’s death in 2019, however, his widow appears to have sharply slowed her public giving—donating less than $4 million between 2018 and 2021, the last year for which records are available.

The David H. Koch Foundation—founded by the manufacturing titan and now...

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