A Twitter account that claims to be affiliated with the hacker group Anonymous said it posted the email addresses and alleged passwords of hundreds of current and former Hill staffers online late Wednesday.

The Twitter handle @OpLastResort warned Congress in a tweet that it’s closely watching how lawmakers respond to the revelations over a pair of controversial National Security Agency surveillance programs. The tweet included a link to a website that listed the email addresses to hundreds of current and former Hill staffers and their alleged passwords for those accounts.

“We mean it. This is a pivotal moment for America, and we will not tolerate failure,” OpLastResort tweeted, including the hashtags #Congress #Senate #FISA and #PRISM.