The attorney general of the U.S. Virgin Islands is targeting dozens of conservative and libertarian organizations in a racketeering lawsuit against climate change skeptics that has been widely described as an effort to silence political opponents.

In a subpoena issued in March, the office of USVI attorney general Claude Walker demanded from Exxon Mobil copies of communications between the oil company and 90 different political and policy organizations “and any other organizations engaged in research or advocacy concerning Climate Change or policies.”

The subpoena was part of a national, coordinated legal campaign by state attorneys general and left-wing advocacy groups to use the legal system against companies and organizations that disagree with and advocate against Democratic policies to address global climate change.

The existence of the subpoena was first reported by the Wall Street Journal in April. A newly released copy obtained by the Washington Free Beacon reveals the names of the organizations targeted in the effort, which had previously been redacted.

Those organizations include some of the nation’s preeminent conservative and libertarian nonprofit groups. The AG is requesting Exxon Mobil communications with the Heritage Foundation, the Cato Institute, the Federalist Society, the Hoover Institution, the Reason Foundation, and the Mercatus Institute, among other groups.

One target of the subpoena, the libertarian Competitive Enterprise Institute, has already publicly responded to Walker. Its attorney called the attorney general’s subpoena “a blatant attempt to intimidate and harass an organization for advancing views that you oppose.”