DHS subpoenas Social media companies to reveal identities of Americans who criticize ICE. Requested information includes names, email addresses, phone numbers.

The Department of Homeland Security is expanding its efforts to identify Americans who oppose Immigration and Customs Enforcement by sending tech companies legal requests for the names, email addresses, telephone numbers and other identifying data behind social media accounts that track or criticize the agency.

In recent months, Google, Reddit, Discord and Meta, which owns Facebook and Instagram, have received hundreds of administrative subpoenas from the Department of Homeland Security, according to four government officials and tech employees privy to the requests. They spoke on the condition of anonymity because they were not authorized to speak publicly.

Google, Meta and Reddit complied with some of the requests, the government officials said. In the subpoenas, the department asked the companies for identifying details of accounts that do not have a real person’s name attached and that have criticized ICE or pointed to the locations of ICE agents. The New York Times saw two subpoenas that were sent to Meta over the last six months.

The tech companies, which can choose whether or not to provide the information, have said they review government requests before complying. Some of the companies notified the people whom the government had requested data on and gave them 10 to 14 days to fight the subpoena in court.

“The government is taking more liberties than they used to,” said Steve Loney, a senior supervising attorney with the American Civil Liberties Union of Pennsylvania. “It’s a whole other level of frequency and lack of accountability.” Over the last six months, Mr. Loney has represented people whose social media account information was sought by the Department of Homeland Security.

The department said it had “broad administrative subpoena authority” but did not address questions about its requests. In court, its lawyers have argued that they are seeking information to help keep ICE agents in the field safe.