"As it happens, the term "white skin privilege" was first popularized in the 1970s by the SDS radicals of "Weatherman," who were carrying on a terrorist war against "Amerikkka," a spelling designed to stigmatize the United States as a nation of Klansmen. Led by presidential friends, Bill Ayers and his wife Bernardine Dohrn, the Weather terrorists called on other whites to renounce their privilege and join a global race war already in progress. Although their methods and style kept the Weather radicals on the political fringe, their views on race reflected those held by the broad ranks of the political left. In the following years, the concept of "white skin privilege" continued to spread until it became an article of faith among all progressives, a concept that accounted for everything that was racially wrong in America beginning with its constitutional founding. As Pax Christi USA, a Catholic organization, explained: "Law in the U.S. protects white skin privilege because white male landowners created the laws to protect their rights, their culture and their wealth." This is the theme of Howard Zinn's A People's History of the United States, the most popular book ever written on the subject, and of university curricula across the nation. Eventually, the concept of white skin privilege was embraced even by liberals who had initially resisted it as slander against a nation that had just concluded a historically unprecedented civil rights revolution. This was because the concept of white skin privilege provided an explanation for the fact that the recent Civil Rights Acts had not led to an equality of results, and that racial disparities persisted even as overt racists and institutional barriers were vanishing from public life. The inconvenient triumph of American tolerance presented an existential problem for civil rights activists, whom it threatened to put out of work. "White skin privilege" offered a solution. As the Southern Poverty Law Center explained: "white skin privilege is not something that white people necessarily do, create or enjoy on purpose," but is rather an unavoidable consequence of the "transparent preference for whiteness that saturates our society." In other words, even if white Americans were no longer racists, they were."