H.R. 1865, the Allow States and Victims to Fight Online Sex Trafficking Act (FOSTA), allows for private lawsuits and criminal prosecutions against Internet platforms and websites, based on the actions of their users. Facing huge new liabilities, the law will undoubtedly lead to platforms policing more user speech.

Despite this ostensibly being about sex trafficking, there is also a lot of push-back from anti-trafficking groups. This law would make it harder to organize, and would also likely drive the trade further underground, making it harder for law enforcement to track.

You can see how your representative voted for it here. I'd also encourage you to contact your Senators to ask them to vote against the Senate version.