From a 1995 article in The Independent:
"For decades in art circles it was either a rumour or a joke, but now it is confirmed as a fact. The Central Intelligence Agency used American modern art - including the works of such artists as Jackson Pollock, Robert Motherwell, Willem de Kooning and Mark Rothko - as a weapon in the Cold War. In the manner of a Renaissance prince - except that it acted secretly - the CIA fostered and promoted American Abstract Expressionist painting around the world for more than 20 years."
Read it all here