Answer:
Isolationists were furious that the Lend-Lease Program ended America's policy of neutrality and non-intervention.
Step-by-step explanation:
"Lend-Lease" is an almost unknown law, but it was an important milestone during World War II. While the Red Army fought against the Germans, by this read the United States delivered weapons, food, airplanes and vehicles to the Soviets, to Britain, China, Free France and other allied nations.
This has infuriated many American isolationists because they believed that the United States should maintain its policy of neutrality through European conflicts. Once the Lend-Lease program was approved, the policy of neutrality and non-interference would be over.