The carrying on of an illegal commercial activity eg attempting to sell drugs or substances that are prohibited.
overall, carrying-on a disreputable or illegal commercial task, such purchase of prohibited substances.
(p. pr. & vb. n.) of Traffic
The investigations of the most recent of Talleyrand's biographers tend to show that the charges made against him of trafficking with the envoys have been overdrawn; but all his apologists admit that irregularities occurred.