The accusation has been fiercely contested by Sanders supporters, who call it a "smear" campaign manufactured by Clinton's team.
Sanders on ‘Bernie Bros’ Accused of Online Harassment: ’We Don’t Want That Crap’
Allegations that BernieBros—outspoken, passionate male supporters of Bernie Sanders—have been harassing people who prefer Hillary Clinton online has become a nettlesome issue for the Sanders campaign.

Democratic presidential candidate Sen. Bernie Sanders (I-Vt.) speaks in Salem, N.H., on Aug. 23, 2015. AP Photo/Cheryl Senter
|Updated: