STORMBREW is a secret internet surveillance program of the National Security Agency (NSA) of the United States.
It was disclosed in the summer of 2013 as part of the leaks by former NSA contractor Edward Snowden.
[1] The program comprises cooperation with a "key corporate partner", which was identified on October 23, 2013 by The Washington Post—quoting NSA historian Matthew Aid—as Verizon.
Then the data is passed on to the NSA, where a second selection is made by briefly copying the traffic and filtering it by using so-called "strong selectors" like phone numbers, e-mail or IP addresses of people and organizations in which NSA is interested.
This corporate partner has servers in Washington, California, Texas, Florida, and in or around New York, Virginia, and Pennsylvania.