https://www.cnet.com/news/reddit-removes-several-firearms-related-forums/

The policy affected subreddits that discussed firearms, ammunition, explosives, drugs, alcohol, tobacco, stolen goods, personal information, paid services involving physical sexual contact and falsified documents. With the move, Reddit joins other high-profile companies that are responding to growing calls for gun control after a rash of mass shootings.

"As of March 21, 2018, we have made a new addition to our content policy forbidding transactions for certain classes of goods and services," Reddit said in a statement. "Moving forward, we are prohibiting transactions that are either illicit or strictly controlled. Communities focused on such transactions and users who attempt to conduct them will be banned from the site."