WASHINGTON (Reuters) – Democratic presidential contender Bernie Sanders on Thursday urged an end to online “bullying or ugly personal attacks” after a powerful hospitality-industry union in Nevada accused his supporters of harassment.

The Culinary Workers Union said supporters of Sanders, a front-runner in the Democratic White House race, “viciously” attacked the organization via Twitter, text, voicemail and direct messaging after the union criticized the senator’s universal healthcare plan on Tuesday.

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