In what officials described as the largest crackdown on graffiti vandalism in King County’s history, prosecutors have filed 34 felony cases against 17 defendants. The alleged taggers, some known by monikers such as “Dotcom,” “ScotyP” and “Wesh” are accused of repeatedly defacing buses, light-rail cars, freeway signs, traffic corridors and small businesses, ultimately costing taxpayers millions of dollars each year.