St-Denis, Paris - They move in packs - always at night - like hyenas, bringing entire communities of tower blocks in the city's suburbs to their knees. These young men are often school dropouts or unemployed, and often from fatherless homes. Their reign of terror is dominated by violence, theft and drug selling. Women complain that they are harassed and sometimes threatened for not complying with their whims. Some law enforcement officials say the violence that has engulfed France's tough suburbs - and yesterday spread to Paris proper - was instigated by criminal gangs hoping to turn their neighbourhoods into...