The Party was also seen as one that had offered help to the doomed Jews of Europe, opposed prejudice, and supported the fledgling state of Israel from enemies that boasted of its plans to destroy the state... George C. Marshall under the Truman Administration advocated abandoning Israel to the tender mercies of its Arab neighbors.Help to the doomed Jews of Europe? Such as the passengers aboard the St Louis?
Or alerting American public of the horrors of the Holocaust
That's a very valid reference to the F. D. Roosevelt Administration's numerous failures and delinquencies in dealing with the Nazi Holocaust abroad. The story of the ship St. Louis was portrayed in the movie Voyage of the Damned, but many other incidents demonstrating similar callousness, on the part of the Administration toward European Jews in that era, are less well known.
An excellent book on the subject is Arthur D. Morse's While Six Million Died: A Chronicle of American Apathy, published in hardcover by Random House and in paperback by Ace Publishing c. 1967.