Nowadays, 193 nations are members of the United Nations. These states are sovereign and they have equal representation in the UN General Assembly. Since it was created in 1945 up to the present, many nations have been incorporated; some of the original members are France, the UK, The USA, Argentina, Canada, Brazil, etc
The principle cause of the war was that those states harbored and supported the actions of pirates against American shipping vessels in the Mediterranean Sea.
The attorney general I believe who started the "red scare" is Robert K.Murray.
You can go to this site to get information on red scare and those involved.