law: Industrial Disputes Act, 1947
  36. Representation of parties
  
  
  (1) A workman who is a party to a dispute shall be entitled to
  
  be represented in any proceeding under this Act by-
  (a) 147[any member of the executive
  
  or other office bearer] of a registered trade union of which he is a member;
  (b) 117[any member of the executive
  
  or other office bearer] of a federation of trade unions to which the trade
  
  union referred to in clause (a) is affiliated;
  (c) where the worker is not a member of any
  
  trade union by 117[any member of the executive or other office
  
  bearer] of any trade union connected with, or by any other workman employed in
  
  the industry in which the worker is employed and authorized in such manner as
  
  may be prescribed.
  (2) An employer who is a party to a dispute shall be entitled to
  
  be represented in any proceeding under this Act by-
  (a) an officer of an association of employer
  
  of which he is a member;
  (b) an officer of a federation of associations
  
  of employers to which the association referred to in clause (a) is, affiliated;
  (c) where the employer is not a member of any
  
  association of employers, by an officer of any association of employers
  
  connected with, or by any other employer engaged in, the industry in which the
  
  employer is engaged and authorized in such manner as may be prescribed.
  (3) No party to a dispute shall be entitled to be represented by
  
  a legal practitioner in any conciliation proceedings under this Act or in any
  
  proceedings before a Court.
  (4) In any proceeding117[before a  Labor Court , Tribunal or National
  
  Tribunal], a party to a dispute may be represented by a legal practitioner with
  
  the consent of the other parties to the proceeding and 156[with the
  
  leave of the Labor Court , Tribunal or National
  
  Tribunal, as the case may be.]