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UK's GCHQ and 'Contact Chaining' - Was Judge Napolitano on to something ?
[UK Independend 20 Nov 2013] Tony Blair’s government gave America permission to store and analyse the email, mobile phone and internet records of potentially millions of innocent Britons. At the same time US security officials drew up plans to spy on British citizens unilaterally, without the knowledge of the UK government.

The revelations have emerged in leaked documents obtained by the National Security Agency (NSA) whistleblower Edward Snowden.

Moving down a bit, key paragraphs follow:

It shows the NSA was still barred from making any UK citizen a target of surveillance that would look at the content of their communications without getting a warrant.

However, they were “authorised to unmask UK contact identifiers resulting from incidental collection”, “utilise the UK contact identifiers in Sigint development contact chaining analysis” and “retain unminimised UK contact identifiers incidentally collected under this authority within content and metadata stores”.
Posted by: Besoeker 2017-04-08
http://www.rantburg.com/poparticle.php?ID=485329