The San Jose Police department cracked down on the city’s largest and most organized graffiti tagging crew this week, announcing the arrests of four suspected members of the HYSU tagging crew. HYSU, which stands for “Have You Seen Us,” is reportedly responsible for over 50 percent of the graffiti around San Jose, and the group recently garnered the attention of the SJPD and other city officials for their “bombing runs,” which were increasing in frequency and intensity.