American diplomatic officials declared it would deny visas to five individuals, including a former EU commissioner, for reportedly seeking to "pressure" American social media platforms into suppressing opinions they disagree with.
"These radical activists and weaponized NGOs have advanced censorship crackdowns by other governments - in each case focusing on US voices and US firms," said Secretary of State Marco Rubio.
Thierry Breton suggested that a "targeted campaign" was occurring.
Breton was described as the "key designer" of the European Union's online content law, which enforces speech regulations on social media firms.
However, it has angered some US conservatives who see it as an attempt to silence right-wing opinions. Brussels rejects this characterization.
The official has been in conflict with Elon Musk, the world's richest man, over requirements to adhere to European regulations.
The European Commission recently fined X €120m over its verification system – the first fine under the DSA. It said the platform's system was "deceptive" because the firm was not "meaningfully verifying users".
In response, Musk's site prevented the European body from making adverts on its platform.
Reacting to the entry restriction, Breton posted on X: "To our American friends: Censorship isn't where you think it is."
Clare Melford, who leads the British disinformation research group, was included in the sanctions.
US Undersecretary of State the official alleged the GDI of using US taxpayer money "to exhort censorship and targeting of American speech and media".
A GDI spokesperson said the visa sanctions as "a repressive move on free expression and an egregious act of state-led suppression".
"These measures today are immoral, unlawful, and contrary to American values," the spokesperson added.
Another figure of the Center for Countering Digital Hate (CCDH), a nonprofit that combats online hate and false information, was similarly issued a ban.
The undersecretary labeled Mr Ahmed a "key collaborator with efforts to weaponize the state apparatus against US citizens".
Also subject to bans were two executives of a German organization, which the State Department said aided in implementing the DSA.
Responding, the two leaders described it as an "attempt to silence by a government that is increasingly disregarding the legal principles".
"We refuse to be silenced by a government that uses accusations of censorship to silence those who defend fundamental freedoms," they concluded.
Rubio said that steps had been taken to impose visa restrictions on "agents of the global censorship-industrial complex" who would be "typically prohibited from entering the United States".
"The administration has been clear that his national sovereignty foreign policy opposes infringements of US autonomy. Extraterritorial overreach by foreign censors aimed at US expression is unacceptable," he affirmed.
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