Who or what was the "New Scare" or menace in America during the early Cold War era?

Who or what was the "New Scare" or menace in America during the early ColdWar era? The first Red Scare occurred shortly after the end of World War I. The nation faced social and economic upheaval as soldiers returned from battle to a changed American society. The scare targeted immigrants, radicals, and labor leaders. The U. S. government deported many people believed to be anarchists