In the case of Penfield Company of California et al. v. Securities & Exchange Commission, 1946, the Supreme Court ruled in favor of the Securities and Exchange Commission (SEC). The court held that SEC had jurisdiction over a real estate transaction involving securities because it was deemed to be an investment contract under federal law. This decision expanded the definition and scope of what could be considered as 'securities' by including non-traditional investments like real estate contracts if they met certain criteria such as expectation of profits from others' efforts. The ruling also affirmed SEC's power to regulate these types of transactions for investor protection against fraud or misrepresentation.

In the dissenting opinion for the Penfield Company of California v. Securities & Exchange Commission case, Justice Frankfurter disagreed with the majority's interpretation of Section 17(a) of the Securities Act. He argued that this section was not intended to give SEC broad powers to regulate all aspects of securities transactions but rather aimed at preventing fraud in specific situations such as initial public offerings (IPOs). According to him, extending these powers beyond their original scope would be a breach of legislative intent and could lead to potential abuses by regulatory authorities. Furthermore, he expressed concerns about due process rights being violated if SEC were allowed unchecked authority over securities transactions without clear guidelines or limitations set by Congress. In his view, it was essential for courts to strictly interpret laws regulating economic activities so as not infringe upon individual liberties and free market principles.