In Brown v. Cole, 155 Tex. 624, 291 S.W.2d 704 (1956), the Texas Supreme Court defined the term "seller" broadly, making liable to an aggrieved buyer any person who served as a "link in the chain of the selling process." Id. at 629, 291 S.W.2d at 708. Under the 1977 amendments the liability for "control persons and aiders" was incorporated into a new section of the statute; the comment pertinent to that section notes that "Brown v. Cole should have no application to the new law, since 33F provides quite specifically who, besides a person who buys or sells, is liable, and the criteria for such liability." A Defendant is liable under this section if they directly or indirectly control a seller, buyer or issuer of a security, 581--33F 1, or if they directly or indirectly, with intent to deceive or defraud, materially aids a seller, buyer or issuer of a security. 581--33F 2.