United States Congressional Joint Immigration Commission

The United States Immigration Commission (also known as the Dillingham Commission after its chairman, Republican Senator William P. Dillingham), was a bipartisan special committee formed in February 1907 by the United States Congress and President Theodore Roosevelt, to study the origins and consequences of recent immigration to the United States. This was in response to increasing political concerns about the effects of immigration and its brief was to report on the social, economic, and moral state of the nation.

Source: Wikipedia — United States Congressional Joint Immigration Commission (CC BY-SA 4.0)