america come alive. we have been watching the actions of san francisco, blocking communication of cell phone devices is unacceptable. reporter: they call themselves anonymous but their tactics are anything but. on sunday afternoon, anonymous hacked into the bart social media well site my bart.according and the so-called hackers turned activists posted the names an personal contact information of over 2,000 bart passengers. passengers like kelsey of oakland. i think it is a juvenile thing to do as far as i m concerned, regardless of what their political message is. reporter: their message? to expose anonymous views as abuse of power. it is a controversial move by bart a few days ago to block cell phone action in some bart stations. reporter: referring to last thursday protest, when bart officials cut cell phone service on the platforms of their downtown san francisco stations, to block communication between activists. bart says it was an attempt to prevent a repeat