I read Radical Son too. Great read.
True but that cast a wide net. A fascinating account of the Federal government's purchase of $30 million worth of goose down from Communist China is in Volume One of the transcripts. The committee was also concerned that the $130 million a year the government was spending on books, films and cultural events to fight communism overseas was going to writers who were working for the Soviets. That is why Daschle Hammett, Helen Goldfrank (Vol.2) and other writers were called to testify.