Attorneys have long been allowed to advertise their services, with restrictions. With the extension of constitutional protection to commercial free speech, the professions were given access to marketing techniques which were formerly unknown. Once the toehold had been established, it was not long until commercial free speech was extended to attorney advertising.
Franco, Robert J. and Johnson, Anne Scheitlin
"The Scope of Attorney Advertising in Illinois,"
Northern Illinois University Law Review: Vol. 11:
2, Article 9.
Available at: https://huskiecommons.lib.niu.edu/niulr/vol11/iss2/9
Northern Illinois University Law Review