Industrial Disputes Act, 1947
(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.