Found this interesting article that Truman himself wrote in Washington Post from 12.22.63, a year after JFK was killed talking about second thoughts (and perhaps regret) over creating C_A.
Sauce:
http://www.maebrussell.com/Prouty/Harry%20Truman's%20CIA%20article.html
Corroboration of sauce:
https://www.cia.gov/library/center-for-the-study-of-intelligence/kent-csi/vol20no1/html/v20i1a02p_0001.htm