What are the last names of the three leaders pictured here at the Yalta Conference?

Yalta Conference, (February 4–11, 1945), major World War II conference of the three chief Allied leaders, Pres. Franklin D. Roosevelt of the United States, Prime Minister Winston Churchill of Great Britain, and Premier Joseph Stalin of the Soviet Union, which met at Yalta in Crimea to plan the final defeat and occupation of Nazi Germany.

Explanation:

https://en.wikipedia.org/wiki/Yalta_Conference

The Yalta Conference, also known as the Crimea Conference and codenamed Argonaut, held February 4–11, 1945, was the World War II meeting of the heads of government of the United States, the United Kingdom, and the Soviet Union to discuss the postwar reorganization of Germany and Europe. The three states were represented by President Franklin D. Roosevelt, Prime Minister Winston Churchill, and Premier Joseph Stalin, respectively. The conference was held near Yalta in Crimea, Soviet Union, within the Livadia, Yusupov, and Vorontsov Palaces. The aim of the conference was to shape a postwar peace that represented not only a collective security order but also a plan to give self-determination to the liberated peoples of Europe. The meeting was intended mainly to discuss the re-establishment of the nations of war-torn Europe. However, within a few years, with the Cold War dividing the continent, the conference became a subject of intense controversy. Yalta was the second of three major wartime conferences among the Big Three. It was preceded by the Tehran Conference in November 1943 and was followed by the Potsdam Conference in July 1945. It was also preceded by a conference in Moscow in October 1944, not attended by Roosevelt, in which Churchill and Stalin had spoken of European Western and Soviet spheres of influence.

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explanation:

the constitution of the united states gave congress the absolute authority over immigration laws