In the case of Koster v. (American) Lumbermens Mutual Casualty Co., 1946, the U.S Supreme Court ruled on a dispute involving jurisdiction and venue in shareholder derivative suits. The plaintiff, a resident of Illinois and minority shareholder in American Lumbermens Mutual Casualty Company, filed suit against company directors alleging mismanagement and breach of fiduciary duty. However, he chose to file this lawsuit in New York rather than Illinois where the corporation was based. The defendants sought dismissal for improper venue but were denied by lower courts. The Supreme Court reversed these decisions stating that while federal law does not prohibit filing such suits outside a corporation's home state, it is within court discretion to dismiss cases if they believe justice would be better served elsewhere - considering factors like convenience for witnesses or parties involved. This ruling established an important precedent: although plaintiffs have some freedom choosing where to file their lawsuits; courts can override this choice under certain circumstances ensuring fair trial conditions are met.

In the dissenting opinion for Koster v. (American) Lumbermens Mutual Casualty Co., Justice Frankfurter disagreed with the majority's decision to allow a derivative suit in federal court based on diversity jurisdiction when both plaintiff and defendant corporations were incorporated in Delaware. He argued that this was an inappropriate use of diversity jurisdiction, which is intended to protect out-of-state defendants from potential bias in state courts. In his view, allowing such suits would encourage forum shopping and could lead to inconsistent legal outcomes depending on where a case was filed. Furthermore, he contended that it undermined principles of corporate law by treating shareholders as individual citizens rather than part of a collective entity incorporated under specific state laws. Thus, he believed that the proper venue for such cases should be determined by the location of incorporation or principal place of business rather than shareholder residence.