The social network will go dark in the nation of 200 million, the result of an escalating fight between Elon Musk and a Brazilian judge over what can be said online.

Brazil blocked the social network X on Friday after its owner, Elon Musk, refused to comply with a Brazilian judge’s orders to suspend certain accounts, the biggest test yet of the billionaire’s efforts to transform the site into a digital town square where just about anything goes.

Alexandre de Moraes, a Brazilian Supreme Court justice, ordered internet providers to block access to X across the nation of 200 million because the company lacked a necessary legal representative in Brazil.

Mr. Musk closed X’s office in Brazil last week after Justice Moraes threatened arrests for ignoring his orders to remove X accounts that he said broke Brazilian laws.

X said that it viewed Justice Moraes’ orders as illegal and that it planned to break their legal seal and publish them. “Free speech is the bedrock of democracy and an unelected pseudo-judge in Brazil is destroying it for political purposes,” Mr. Musk wrote in a post on Friday.

In a highly unusual move, Justice Moraes also said that any person in Brazil who tried to still use X via common privacy software called a virtual private network, or VPN, could be fined nearly $9,000 a day.

In another uncommon move, Justice Moraes froze the finances of a second Musk business in Brazil, SpaceX’s Starlink satellite-internet service, to try to collect $3 million in fines he has levied against X. Starlink — which has recently exploded in popularity in Brazil, with more than 250,000 customers — said that it planned to fight the order and would make its service free in Brazil if necessary.

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