  The September 11 attack on the US has revealed an unprecedented terrorism
with worldwide range of destruction. It is argued to result from the first
worldwide percolation of passive supporters. They are people sympathetic to the
terrorism cause but without being involved with it. They just don't oppose it
in case they could. This scheme puts suppression of the percolation as the
major strategic issue in the fight against terrorism. Acting on the population
is shown to be useless. Instead a new strategic scheme is suggested to increase
the terrorism percolation threshold and in turn suppress the percolation. The
relevant associated space is identified as a multi-dimensional social space
including both the ground earth surface and all various independent flags
displayed by the terrorist group. Some hints are given on how to shrink the
geographical spreading of terrorism threat. The model apply to a large spectrum
of clandestine activities including guerilla warfare as well as tax evasion,
corruption, illegal gambling, illegal prostitution and black markets.
