Whoever, not being licensed, carries on such business or is concerned therein within such city or town; or, being licensed, carries on such business or is concerned therein in any other place or manner than that designated in his license or after notice to him that his license has been revoked; or who wilfully hinders, obstructs or prevents any person from entering the premises or from making the examination authorized in the preceding section; or who otherwise violates any provision of this subchapter, shall be fined not more than $50, or imprisoned not more than sixty days, or both.