A fundraiser to throw a “rager” for the University of North Carolina-Chapel Hill frat brothers who protected the Stars and Stripes from an anti-Israel mob this week has raised an eye-watering $400,000. And billionaire hedge fund manager Bill Ackman is a fan — donating $10,000 to the cause. The GoFundMe contribution — spotted Wednesday night by an eagle-eyed X user — will help throw the patriotic pack of Pi Kappa Phi members “the party they deserve,” according to a description on the fundraising site.