Trumbo aligned himself with the Communist Party in the United States before the 1940s,[13] although he did not join the party until 1943.[12][14] He was an isolationist, and wrote a novel The Remarkable Andrew, in which the ghost of Andrew Jackson appears, to caution the United States not to get involved in World War II. In a review of the book, Time Magazine wise-cracked "General Jackson's opinions need surprise no one who has observed George Washington and Abraham Lincoln zealously following the Communist Party Line in recent years."[15] Shortly after the 1941 German invasion of the Soviet Union, Trumbo and his publisher decided to suspend reprinting Johnny Got His Gun until the end of the war. During the war, Trumbo received letters from individuals "denouncing Jews" and using Johnny to support their arguments for "an immediate negotiated peace" with Nazi Germany; Trumbo reported these correspondents to the FBI.[16] Trumbo regretted this decision, which he called "foolish".