In the case of United States v. First National Bancorporation, Inc., et al., 1972, the U.S Supreme Court dealt with an antitrust issue involving a bank merger. The government challenged the acquisition of Commercial Security Bank by First National Bancorporation under Section 7 of Clayton Act which prohibits mergers that may lessen competition or create monopoly in any line of commerce. The District Court dismissed the complaint on grounds that banking was not considered "commerce" within meaning and intent of Clayton Act but rather it fell under "other terms". However, this decision was reversed by Supreme Court stating that banking is indeed a part of commerce as per Sherman Antitrust Act and therefore falls within purview of Clayton Act too. Thus, it held that bank mergers can be scrutinized for their potential anti-competitive effects.

In the dissenting opinion for United States v. First National Bancorporation, Inc., Justice Powell argued that the majority's decision was based on an overly broad interpretation of Section 7 of the Clayton Act. He contended that this section should not be applied to bank mergers unless there is a clear and direct threat to competition in a specific market area. According to him, such application would lead to unnecessary federal intervention in local banking matters and could potentially stifle growth within the industry by limiting banks' ability to merge or acquire other institutions. Furthermore, he expressed concern over how this ruling might impact smaller community banks who may need mergers or acquisitions as part of their survival strategy against larger national competitors.