law: Industrial Disputes Act, 1947
  24. Il-legal strikes and Lockouts
  (1) A strike or lock-out shall be illegal if-
  (i) it is commenced or declared in
  
  contravention of section 22 or section 23; or
  (ii) it is continued in contravention of an
  
  order made under sub-section (3) of section 10 107[or sub-section
  
  (4A) of Section 10A].
  (2) Where a strike or lock-out in pursuance of an industrial
  
  dispute has already commenced and is in existence at the time of the reference
  
  of the dispute to a Board, 107[an arbitrator, a]117[Labor
  
  Court, Tribunal or National Tribunal], the continuance of such strike or
  
  lock-out shall not be deemed to be illegal, provided that such strike or lock
  
  out was not at its commencement in contravention of the provisions of this Act
  
  or the continuance thereof was not prohibited under sub-section(3) of section
  
  10 107[or sub-section (4A) of section 10A].
  (3) A lock-out declared in consequence of an illegal strike or a
  
  strike declared in consequence of an illegal lock-out shall not be deemed to be
  
  illegal.