Final answer:
The executive power granted by the National Industrial Recovery Act that was ruled unconstitutional by the Supreme Court in Schechter v. U.S. involved the regulation of commerce.
Step-by-step explanation:
The National Industrial Recovery Act (NIRA) granted the executive power to regulate aspects of American industry, such as labor conditions and pay. However, in the Supreme Court decision of Schechter v. U.S., the court ruled that a specific executive power granted by the NIRA was unconstitutional. The court determined that the act shifted the power to regulate commerce from the legislative branch to the executive branch, which violated the Constitution.