Drug pushing has long been a stain on Washington Square Park , declassing its iconic arch and proximity to NYU. Parents from around the world pay some $93,000 per year for their children to attend the august institution, despite hardened street dealers operating in all-too-close proximity. While street performers sharpen their acts, chess players position pieces on stone tables and NYU kids enjoy the park as a de facto campus, there have always been shadowy dudes hissing about their loose