Anonymous, a hacker-activist group, ha claimed responsibility for hijacking the federal government’s U.S. Sentencing Commission website to avenge the death of Aaron Swartz, an internet activist who allegedly committed suicide two weeks ago.

An independent agency of the judicial branch, the U.S. Sentencing Commission website was taken over around 9pm PST, after a first attack on Friday morning was unsuccessful, with a warning in response to Swartz’s alleged suicide that read, “a line was crossed.” By 3am PST the site was completely down.

Their campaign has been titled, “Operation Last Resort.” The first salvo launched against the USSC they refer to as a “warhead.”

According to Violet Blue at ZDNet,

It appears that via the U.S. government website, Anonymous had distributed encrypted government files and left a statement on the website that de-encryption keys would be publicly released (thus releasing the as-yet unknown information held on the stolen files) if the U.S. government did not comply with Anonymous’ ultimatum demands for legal reform.

Anonymous has not specified exactly what files they have obtained. The various files were named after Supreme Court judges.