Any person who commits, or who willfully aids, abets, counsels, commands, induces, or procures the commission of, a violation of any of the provisions of this chapter, or any of the rules, regulations, or orders issued pursuant to this chapter, or who acts in combination or concert with any other person in any such violation, or who willfully causes an act to be done or omitted which if directly performed or omitted by him or another would be a violation of the provisions of this chapter or any of such rules, regulations, or orders may be held responsible for such violation as a principal.