They are a staple of any college campus: leaflets, posters and stickers promoting clubs, meetings and parties.

From afar, they look innocuous — and most are. But upon closer inspection, a growing number are promoting white supremacist propaganda such as “America Is Not for Sale,” “One Nation Against Invasion” and “Reclaim America.”

The distribution of such propaganda on college and university campuses nearly doubled last year, to 630 reported incidents from 320 in 2018, the Anti-Defamation League documented in a report released Wednesday. There were 410 reported incidents in the fall semester, it said, more than double any previous college term since the organization began its tally in 2016.

The Anti-Defamation League attributed part of the increase to greater vigilance from those reporting the propaganda.