The Enemy Within: The McClellan Committee's Crusade Against Jimmy Hoffa and Corrupt Labor Unions is a book by American politician Robert F. Kennedy[1] (assisted by John Seigenthaler)[2] first published in 1960, and republished in 1994.[3]Edwin Guthman, chairman of the Robert F. Kennedy Memorial provided the introduction to the 1994 edition.[3] As Robert Kennedy was intimately involved, the book is somewhat autobiographical.