The pile of lawsuits against the Federal Communications Commission over its decision to overturn Obama-era net neutrality regulations has grown, with big-name technology companies banding together to file a petition in the U.S. Court of Appeals for the D.C. Circuit on Monday.

Foursquare, Kickstarter, Automattic, Etsy, Expa and Shutterstock filed the action as members of the Coalition for Internet Openness, a pro-net neutrality group. They are challenging the FCC,  which back in December opted to overturn the 2015 Open Internet Order, a set of rules that require internet service providers to treat all content equally without blocking or slowing down access to specific sites.