=John Dos Passos and Ernest Hemingway: Liberal Causes Abroad.= Glenn Spotswood’s geographical and political odyssey, abruptly ended by a rebel bullet in the Spanish Civil War, forms the central theme of Dos Passos’ _Adventures of a Young Man_ (1938). Politically conscious even as a boy, Glenn becomes successively a transient worker, a cum laude college graduate, a Communist labor organizer, and a disillusioned member of a splinter group. Clearly and dispassionately, Dos Passos allows his story to unfold. There are unsavory, dislikable characters such as fierce but noncombatant Comrade Irving Silverstone and sinister Jed Farrington, an American Communist who, as a Spanish loyalist colonel, divides his lethal attentions between the rebels and political unreliables. But one has the feeling that the author is not leaning in any direction. In the prose poems interspersed throughout the novel, however, Dos Passos lectures his reader. The concluding paragraph analyzes the growth of the American Communist Party and explains the gullibility of the Americans deceived by it. The last lines tell the reader that only a people suspicious of self-serving exhortations willing to risk decisions, each man making his own, dare call themselves free, and that when we say the people, ... we mean every suffering citizen, and more particularly you and me. A little less obvious was the position of Ernest Hemingway in his fine novel _For Whom the Bell Tolls_ (1943). Hemingway would very probably disclaim any intent to write a political novel, but his book teaches a lesson in one of the oldest and surest ways--by example. Robert Jordan has left his instructorship in Spanish at the University of Montana to go to Spain as a demolition expert for the loyalists. Although he has placed himself under Communist discipline for military reasons, he is not a Communist. He is a teacher who has taken a most un-sabbatical leave to fight Fascism in a country he loves. Following the pattern of most of these books, Hemingway sums up a few pages from the end. Badly injured and unable to make his escape, Jordan lies waiting in the forest to fight a fatal rearguard action which will buy time for his escaping friends. He thinks: I have fought for what I believed in for a year now. If we win here we will win everywhere. The world is a fine place and worth the fighting and I hate very much to leave it.