Sleeping Giants is far from the most recognizable name among left-wing activist groups, but it’s made its presence felt in numerous boycott campaigns against conservative commentators, publications, and organizations. Now, a Daily Caller News Foundation investigation has unmasked its anonymous founder. Sleeping Giants launched in November 2016, with a self-described mission of “stopping racist, sexist, homophobic, xenophobic and anti-Semitic news sites by stopping their ad dollars.” Its targets have included the prominent conservative website Breitbart, conservative talk show host Laura Ingraham, the Canada-based Rebel Media, former Fox News host Bill O’Reilly, and the National Rifle Association (NRA). The group’s primary...