They monitored his correspondence for clues , but appear not to have noticed that he published , in 1942 , a book called capitalism , socialism and democracy : bookshop visits were not , it would seem , part of their tradecraft .

他们监控他的信件，从中寻找线索，但似乎并未注意到他在1942年出版了《资本主义、社会主义与民主》一书看来书店不属于他们的谍报活动范畴。