From the moment of Einstein's arrival in the U.S. in l933 until his death in l955, J. Edgar Hoover's FBI, with help from several other federal agencies, busied itself collecting "derogatory information" in an effort to undermine Einstein's influence and destroy his prestige. For the first time Fred Jerome tells the story of that anti-Einstein campaign, as well as the story behind it - why and how the campaign originated, and thereby provides the first detailed picture of Einstein's little known political activism.Unlike the popular image of Einstein as an absent-minded, head-in-the-clouds genius, the man was in fact intensely politically active and felt it was his duty to use his world-wide fame shrewdly in the cause of social justice. A passionate pacifist, socialist, internationalist and outspoken critic of racism (Einstein considered racism America's "worst disease"), and personal friend of Paul Robeson and W.E.B. DuBois, Einstein used his immense prestige to denounce McCarthy at the height of his power, publicly urging witnesses to refuse to testify before HUAC.The story that emerges not only reveals a little known aspect of Einstein's character, but underscores the dangers that can arise, to threaten the American Republic and the rule of law, in times of obsession with national security.