For decades, a group of territorial surfers in Palos Verdes — the so-called Bay Boys of Lunada Bay — has been operating very much like a street gang, authorities and locals say. They are accused of staking out turf on a public beach and in the waves, and intimidating and assaulting people who dare to try to access that turf. Tires have been reported slashed, rocks hurled at visitors, death threats leveled. Pretty nasty stuff. The Bay Boys even have a sort-of clubhouse, an unpermitted structure built on the beach where gang members can hang out and survey the domain...