Any person violating any of the provisions of this section shall be liable for a penalty of not less than $100 nor more than $1,000 to be collected in a civil action by a summary proceeding. Any violation of this section by an officer, agent or employee shall be a violation by the employer if such employer had knowledge of and actual control over the cause of such violation. Where the violation is of a continuing nature, each day during which it continues shall constitute an additional, separate and distinct offense.