545 U.S. 308 (2005)
The case of Grable & Sons Metal Products, Inc. v.
Can a federal court exercise jurisdiction over a state law claim on the grounds that it involves significant federal issues?
Federal courts have jurisdiction over state law claims that necessarily raise a stated federal issue, actual and disputed, which is substantial, and where a federal forum may entertain the issue without disturbing the balance between federal and state judicial responsibilities.
The Supreme Court held that the federal court properly exercised jurisdiction over the case because Grable's claim hinged on the interpretation or application of the federal tax code, a substantial issue of federal law.
The significance of the Grable & Sons decision lies in its establishment of a clear criterion for invoking federal jurisdiction over state law claims: the presence of a significant federal issue. It confirmed that not every question involving federal law needs to be heard in federal court, and the case illustrates the balance necessary to prevent the federal docket from becoming overcrowded with state law claims. Law students and practitioners must understand the parameters delineated by this case to determine when federal question jurisdiction is appropriate.