An artistic, anarchic, political movement in Amstedam in the mid-1960s. One of its founders, Roel van Duijn, is now active as a green politician in the Oud Zuid borough council.
All about the provos from a column in the San Francisco Examiner in 1966
And this article from High Times. The photos have not transfered properly to internet, but if you are interested in counter-culture, its a must.