Bannon oversaw Cambridge Analytica's collection of Facebook data, according to former employee
LONDON - Conservative strategist Steve Bannon oversaw Cambridge Analytica's early efforts to collect troves of Facebook data as part of an ambitious program to build detailed profiles of millions of American voters, a former employee of the data-science firm said Tuesday.
The 2014 effort was part of a high-tech form of voter persuasion touted by the…

