Prosecutors say Kane Gamble conned call centers during 2015-16 into revealing information that got him into the accounts of then-FBI director Mark Giuliano, then-Secretary of Homeland Security Jeh Johnson, then-CIA chief John Brennan and other officials.
They say Gamble, who was part of a group of hackers called "Crackas With Attitude," put some of the information he gathered online. Gamble pleaded guilty last year. The 18-year-old was sentenced to youth custody on Friday in a London criminal court.
Judge Charles Haddon-Cave said his "nasty campaign of politically motivated cyber-terrorism" had left victims feeling violated.