--- Ah! there it is:

ICE watchers say agents used software to threaten and follow them home

'This is a warning. We know you live right here'

Two US residents have sued several Homeland Security agencies and officials, including Secretary Kristi Noem, for allegedly using surveillance tools to harass them, branding them as "domestic terrorists," and even showing up at their homes based on license-plate recognition.

On Monday, the nonprofit Protect Democracy filed a class action lawsuit on behalf of two Mainers, Elinor Hilton and Colleen Fagan, and other unnamed plaintiffs over what they describe as unconstitutional surveillance designed to deter them from exercising their First Amendment rights. [...]

Follow the link for full details. Warning: It's rather longer than will fit in a BBC red-button article.