In the case of Daniel, Attorney General, et al. v. Family Security Life Insurance Co. et al., 1948, the Supreme Court ruled on a dispute involving insurance regulation and interstate commerce. The state of Alabama had enacted legislation requiring out-of-state insurance companies to obtain a license before soliciting business within its borders and imposed taxes on these companies' premiums as well as penalties for non-compliance with this law. Family Security Life Insurance Company challenged this law arguing that it violated the Commerce Clause by placing an undue burden on interstate commerce. The Supreme Court upheld Alabama's right to regulate and tax out-of-state insurers operating within its boundaries under its police powers reserved by the Tenth Amendment despite their impact on interstate commerce because such regulations were necessary for protecting policyholders in Alabama from insolvent or fraudulent insurers. This decision affirmed states' rights to regulate industries like insurance where there is a significant local interest at stake even if those regulations have some effect on interstate trade or business activities.

In the dissenting opinion for Daniel, Attorney General, et al. v. Family Security Life Insurance Co. et al., Justice Frankfurter argued that the majority's decision to allow a state law requiring out-of-state insurance companies to maintain reserves equal to those required by their home states was an unconstitutional violation of the Commerce Clause. He contended that this ruling would permit individual states to impose burdensome and conflicting regulations on interstate commerce in insurance, which could potentially disrupt or even destroy it entirely. Furthermore, he disagreed with the majority's interpretation of Congress' intent when passing legislation related to insurance regulation; instead of intending for each state to be able regulate freely without regard for its impact on interstate commerce as suggested by the majority, he believed Congress intended only limited state regulatory power over such matters.