Was there an organization that was against the United States joining World War I?

There was
no one group dedicated to keeping America out of WWI, but there were many groups who were
interested in keeping America neutral.  German groups in America did not want the United States
to join the Allied side--they were also equally against arms supplies going from the U.S. to the
Entente powers because they viewed it as a violation of American neutrality.  Irish independence
groups in America also did not want America to join any side which advanced British interests.
 Socialists saw the war as a way to make money for capitalists interests in America, and leading
Socialist Eugene Debs actually went to prison for criticizing American involvement in
the...