SiegedSec, a collective of self-proclaimed “gay furry hackers,” has claimed credit for breaching online databases of the Heritage Foundation, the conservative think tank that spearheaded the rightwing Project 2025 playbook. On Wednesday, as part of string of hacks aimed at organizations that oppose trans rights, SiegedSec released a cache of Heritage Foundation material.

In a post to Telegram announcing the hack, SiegedSec called Project 2025 “an authoritarian Christian nationalist plan to reform the United States government.” The attack was part of the group’s #OpTransRights campaign, which recently targeted rightwing media outlet Real America’s Voice, the Hillsong megachurch, and a Minnesota pastor.

In his foreword to the Project 2025 manifesto, the Heritage Foundation’s president, Kevin Roberts, rails against “the toxic normalization of transgenderism” and “the omnipresent propagation of transgender ideology.” The playbook’s other contributors call on “the next conservative administration” to roll back certain policies, including allowing trans people to serve in the military.

“We’re strongly against Project 2025 and everything the Heritage Foundation stands for,” one of SiegedSec’s leaders, who goes by the handle vio, told The Intercept.