4.—Where the holder of a licence under this Act has been convicted of an offence under this Act or has given false information in an application under section 3 of this Act or where in the opinion of the Minister—

(a) the holder is no longer a suitable person to carry on the business of an employment agency, or

(b) the premises where the holder is carrying on the business of an employment agency no longer conform to the prescribed standards,

the Minister may revoke the licence.