Project Salt Box is an investigative newsletter tracing the contracts, spending and property deals behind US immigration detention, using public records and documents. Recent issues cover a sole-source legal contractor for CBP litigation, a no-bid extension of the Camp East Montana detention contract, and a possible new ICE office in Round Rock, Texas.

Economist Bryan Caplan's newsletter offers sharp, opinionated essays on social science, power, immigration, and public intellectuals, often built around experiments and debates. Readers get original arguments with a clear point of view, plus guest replies and analysis of how commentators express contempt and sentiment.

Independent reporting from the U.S.-Mexico border covering border wall construction, immigration enforcement, and borderland history and culture. It also runs Wall Watch, a community-powered map tracking border wall contracts, surveillance technology and construction.

Gillian Brockell publishes investigative reporting on US deportation and ICE removal flights, tracking aircraft, contracts and third-country removals with flight data and sourced reporting. Readers get detailed, documented updates on how the government's deportation air operations are run and who profits from them.