The FOSTA (Allow States and Victims to Fight Online Sex Trafficking Act) and SESTA (Stop Enabling Sex Traffickers Act) are the U.S. Senate and House bills that became law on April 11, 2018. They clarify the country's sex trafficking law to make it illegal to knowingly assist, facilitate, or support sex trafficking, and amend the Section 230 safe harbors of the Communications Decency Act (which make online services immune from civil liability for the actions of their users) to exclude enforcement of federal or state sex trafficking laws from its immunity. Senate sponsor Rob Portman had previously led an investigation into the online classifieds service Backpage (which had been accused of facilitating child sex trafficking), and argued that Section 230 was protecting its "unscrupulous busine