Their late-night bullhorn protests at public officials’ homes come as Sanders’ opponents are increasingly calling out his supporters’ behavior.

The night before the Nevada caucuses, the chairman of the state’s Democratic Party called police after several supporters of Bernie Sanders gathered outside his home at 11 p.m. with a bullhorn to issue a warning about the next day’s election.

“I want assurances that there isn’t going to be any shenanigans going on tomorrow. The Democratic Party does not control what happens,” Maria Estrada, a self-described “Berner” from Los Angeles, said into the bullhorn, according to a Facebook Live video she streamed on her personal page. She repeatedly said she didn’t want to see a repeat of the 2016 election, which she insinuated was rigged against Sanders.

At least three other times in recent days, Estrada led a group of Sanders supporters who gathered late at night outside the homes of Democratic Party officials and California lawmakers, including those of Secretary of State Alex Padilla and state Democratic Party Chairman Rusty Hicks. Police were called at least twice.