No prosecution for any offence punishable under this Act shall be instituted except with the previous sanction of the Government.

Delegation 21. The Board may, by general or special order in writing, delegate to the Chairman or any other member or to any officer of the Board, subject to such conditions and limitations if any, as may be specified in the order, such of its powers and functions under this Act (except the power under section 26) as it may deem necessary.