According to the ACLU [1]:

> This document explains two key ways that recipients can resist immigration administrative subpoenas: First, any gag order in these subpoenas has no legal effect; you are free to publicize them and inform the target of the subpoena. Second, you do not have to comply with the subpoena at all, unless ICE goes to court—where you can raise a number of possible objections—and the court orders compliance.

[1]: https://www.acluofnorthcarolina.org/app/uploads/drupal/sites...