The Central Intelligence Agency and the National Security Agency may be the best-known among several U.S. spy agencies, but there are others as well, as detailed in a top-secret budget document that former NSA contractor Edward Snowden provided to The Washington Post. The chart below shows the relative sizes of the largest of them:

The National Reconnaissance Office operates satellites and other remote sensors. Earlier this week, the office launched a very large rocket carrying a spy satellite from Vandenberg Air Force Base in California. The budget of the National Geospatial-Intelligence Program, which provides maps for military and intelligence purposes, is more than twice what it was in 2004. Along with the NSA, the program’s analysts and technicians began using individuals’ cellphone numbers to track their locations on behalf of military units and drone operators soon after Sept. 11, 2001.

The document Snowden provided to The Post was a summary of the so-called “black budget,” which is the secret portion of the federal budget dedicated to intelligence gathering and analysis. Read Barton Gellman and Greg Miller’s full article here.