@OccupyWailSt is IMPERSONATING @OccupyWallSt Go to its profile, click menu, Report as Spam; then block #p2 (RT?)
(Note that upper case "i" (eye) reads like lower case eL). If you have a name with any eLs in them, register the potential clone name before your enemies and trolls do this to you.
@OccupyWallSt has been informed, and is taking action with twitter. It is not always easy to press an impersonation case (twitter considers most to be parody), but since they are using a similar web address, it may be possible.
Report as spam usually helps, when done in LARGE volume.