A $40,000-an-Hour Fee, Lawsuits Rock Artist Foundations

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How did the artistic legacies of Motherwell, Rauschenberg and Twombly turn into the gunfight at the O.K. Corral?

The philanthropic mood at some artist-endowed foundations, a fast-growing niche among charities, has given way to rancor rife with accusations of salaries too high and fees unaccounted for or unjustified. Current or former trustees of at least three foundations have embroiled the nonprofits in legal actions.