(a) Any person who, either as director, officer, or agent of any firm or corporation or as agent of any person violating the provisions of this subchapter, assists or aids, directly or indirectly, in the violation shall be responsible therefor equally with the person, firm, or corporation for whom or which he or she acts.
(b) In the prosecution of any person as officer, director, or agent, it shall be sufficient to allege and prove the unlawful intent of the person, firm, or corporation for whom or which he or she acts.