law: Industrial Disputes Act, 1947
  22. Prohibition of strikes and Lockouts
  (1) No person employed in a public utility service shall go on
  
  strike in breach of contract-
  (a) without giving to the employer notice of
  
  strike, as hereinafter provided, within six weeks before striking; or
  (b) within fourteen days of giving such
  
  notice; or
  (c) before the expiry of the date of strike
  
  specified in any such notice as aforesaid; or
  (d) during the pendency of any conciliation
  
  proceedings before a conciliation officer and seven days after the conclusion
  
  of such proceedings.
  (2) No employer carrying on any public utility service shall
  
  lock-out any of his workmen-
  (a) without giving them notice of lock-out as
  
  hereinafter provided, within six weeks before locking-out; or
  (b) within fourteen days of giving such
  
  notice; or
  (c) before the. expiry of the date of lock-out
  
  specified in any such notice as aforesaid. or
  (d) during the pendency of any conciliation
  
  proceedings before a conciliation officer and seven days after the conclusion
  
  of such proceedings.
  (3) The notice of lock-out or strike under this section shall
  
  not be necessary where there is already in existence a strike or, as the case
  
  may be, lock-out in the public utility service, but the employer shall send
  
  intimation of such lock-out or strike on the day on which it is declared, to
  
  such authority as may be specified by the appropriate government either
  
  generally or for a particular area or for a particular class of public utility
  
  services.
  (4) The notice of strike referred to in sub-section(l) shall be
  
  given by such number of persons to such person or persons and in such manner as
  
  maybe prescribed.
  (5) The notice of lock-out referred to in sub-section (2) shall
  
  be given in such manner as may be prescribed.
  (6) If on any day an employer receives from any person employed
  
  by him any such notices as are referred to in sub-section (1) or gives to any
  
  person employed by him any such notices as are referred to in sub-section (2),
  
  he shall within five days thereof report to the appropriate government or to
  
  such authority as that government may prescribe, the number of such notices
  
  received or given on that day.