The units, dubbed "Churchill's Secret Army", were set up to relay vital information about enemy movements and help mount counter-attacks as Britain braced itself for occupation.

BBC: Secret wartime bunker near Cardiff opened to public

As with the "mass custom" trend in auto manufacturing, information technology and "just in time" techniques make it possible to classify individual voters by income, occupation, religion and favorite issues and build customized appeals for them.

FORBES: Magazine Article