KEY POINTS

Supporters of a federal law passed earlier this year aimed at eliminating online sex trafficking say it has already led to a significant drop in online advertising for sex. But critics say the law is merely pushing the trade further underground, and they hope to get the law overturned.

The law, known by its House and Senate titles, the Fight Online Sex Trafficking Act and Stop Enabling Sex Traffickers Act, or FOSTA/SESTA, was perhaps best known for persuading the advertising site Craigslist to discontinue its popular personal ads earlier this year. But the law's main target was more explicit sites like Backpage — which the feds seized shortly before the bill became law — that were alleged breeding grounds for trafficking and other abuses.