Sandvine, a network equipment company, was added “List of Entities” from the Ministry of Commerce for providing technology to the Egyptian government, “where it is used in mass surveillance and censorship online to block information and target political actors and human rights activists.”says an article published in the Federal Register, the official journal of the American government.

Sandvine, who is accused of facilitating surveillance of the Egyptian opposition, provides a so-called “Deep packet inspection technology“, which examines and manages network traffic. As a result of its inclusion on the list, US companies are effectively prohibited from supplying goods and technology to Sandvine.

The Commerce Department also added Chinese company Chengdu Beizhan Electronics to the list of companies that illegally purchased U.S.-origin items on behalf of the University of Electronic Science and Technology, which was added more than a decade ago.

The Commerce Ministry said the university is a pseudonym for the Chinese Academy of Engineering Physics (CAEP), which is involved in China’s nuclear weapons program.

“We will continue to use all of our enforcement and regulatory authorities to prevent U.S. technology from enabling destabilizing activities, from mass surveillance to targeting human rights activists and political opponents of nuclear weapons programsTrading chief Matthew Axelrod said in a statement to the publication.

In addition to Waterloo, Ontario, Canada, Sandvine locations in India, Japan, Malaysia, Sweden and the United Arab Emirates are on the export control list.

Sandvine did not immediately respond to a request for comment. Representatives of the Egyptian embassy in Washington and the Egyptian government also did not respond. Chengdu Beizhan Electronics could not be immediately contacted.