Section 339-C. Trading by brokers against customers' orders

A broker, who,
  being  employed  by  a customer to buy and carry upon margin the stocks,
  bonds  or  other  evidences  of  debt  of  a  corporation,  company   or
  association, while acting as broker for such customer in respect of such
  stocks,  bonds or other evidences of debt, sells for his own account the
  same kind or issue of stocks, bonds or other evidences of debt  of  such
  corporation,  company  or  association, with intent to trade against the
  customer's order, or, who, being employed by  a  customer  to  sell  the
  stocks,  bonds  or  other evidences of debt of a corporation, company or
  association, while acting as broker for such customer in respect to  the
  sale of such stocks, bonds or other evidences of debt, purchases for his
  own account the same kind or issue of stock, bonds or other evidences of
  debt  of  such corporation, company or association, with intent to trade
  against the customer's order, is guilty of a misdemeanor.