Chris Hughes helped Mark Zuckerberg transform Facebook from a dorm-room project into a real business. Now, he's calling for the company to be broken up.

In a lengthy opinion piece published Thursday by the New York Times, Hughes says that Zuckerberg has "unchecked power" and influence "far beyond that of anyone else in the private sector or in government."

It's time, he writes, for regulators to break up Facebook (FB).

"Mark is a good, kind person. But I'm angry that his focus on growth led him to sacrifice security and civility for clicks," writes Hughes.

"I'm disappointed in myself and the early Facebook team for not thinking more about how the News Feed algorithm could change our culture, influence elections and empower nationalist leaders," he continues. "And I'm worried that Mark has surrounded himself with a team that reinforces his beliefs instead of challenging them."