Twitter on Friday said it had started suspending and restricting accounts posting content promoting U.S. Democratic presidential candidate Michael Bloomberg.

“We took enforcement action on about 70 accounts, which includes a combination of permanent suspensions and account challenges to verify ownership,” a Twitter spokeswoman said.

Twitter said the accounts violated its platform manipulation and spam policy, which prohibits coordination among accounts to amplify or disrupt conversation by using multiple accounts.

This can refer to creating several accounts to post duplicative content but also includes “coordinating with or compensating others to engage in artificial engagement or amplification, even if the people involved use only one account.”

The billionaire candidate’s campaign, which has been pouring unparalleled amounts of money into an online advertising campaign, is also hiring hundreds of digital organizers to support the candidate, including by pushing content to their own social media channels.