law: The Prevention of Terrorism Act, 2002
  Chapter III Terrorist
  
  Organisations
  18. Declaration of an
  
  organization as a terrorist organization.-
  1.  For
  
  the purposes of this Act, an organisation is a terrorist organisation if-
  a.   it is listed in the
  
  Schedule, or
  b.   it operates under the
  
  same name as an organisation listed in that Schedule.
  1.  
  2.  The
  
  Central Government may by order, in the Official Gazette,-
  a.   add an organisation
  
  to the Schedule;
  b.   remove an
  
  organisation from that Schedule;
  c.   amend that Schedule
  
  in some other way.
  1.  
  2.  
  3.  The
  
  Central Government may exercise its power under clause (a) of sub-section (2)
  
  in respect of an organisation only if it believes that it is involved in
  
  terrorism.
  4.    For
  
  the purposes of sub-section (3), an organisation shall be deemed to be involved
  
  in terrorism if it-
  a.   commits or
  
  participates in acts of terrorism,
  b.   prepares for
  
  terrorism,
  c.   promotes or
  
  encourages terrorism, or
  d.   is otherwise involved
  
  in terrorism.