But we know more today than we did a few weeks ago. In response to a Freedom of Information Act lawsuit filed by the ACLU and Yale Law School‘s Media Freedom and Information Access Clinic, the CIA has released a slew of documents concerning CIA surveillance under EO 12333. (The Justice Department has also recently released a set of documents related to the executive order.)

The national debate in the 1970s about the proper limits of U.S. government spying on its own citizens was, to a large extent, about the CIA. In the wake of the Watergate scandal and news stories about other illegal CIA activity, President Gerald Ford and Congress launched investigations into the full range of CIA misdeeds — from domestic spying programs and infiltration of leftist organizations to experimentation on non-consenting human subjects and attempts to assassinate foreign leaders.