(5) Upon receipt of a notification under subsection (4c) the Minister shall give his decision thereon; where the Minister decides that recognition is to be accorded, such recognition shall be deemed to be accorded by the employer or trade union of employers concerned, as the case may be, as from such date as the Minister may specify; a decision of the Minister under this subsection may include a decision as to who are workmen employed in a managerial, executive, confidential or security capacity.