The U.S. on Tuesday added dozens of Chinese tech companies to its export blacklist in its first such effort under the Donald Trump administration, as it doubles down on curtailing Beijing’s artificial intelligence and advanced computing capabilities.

The U.S. Department of Commerce’s Bureau of Industry and Security added 80 organizations to an “entity list,” with more than 50 from China, barring American companies from supplying to those on the list without government permits.

The companies were blacklisted for allegedly acting contrary to U.S. national security and foreign policy interests, the agency said, as part of its efforts to further restrict Beijing’s access to exascale computing tech, which can process vast amounts of data at very high speeds, as well as quantum technologies.

Dozens of Chinese entities were targeted for their alleged involvement in developing advanced AI, supercomputers and high-performance AI chips for military purposes, the Commerce Department said, adding that two firms were supplying to sanctioned entities such as Huawei and its affiliated chipmaker HiSilicon.