Smith confirmed, via his website, that he inked some pages of this story. Severin colors per this site: http://www.hakes.com/item.asp?Auction=210&ItemNo=127472
Part 1 of 3. First appearance of HYDRA in a SHIELD story since the death of Baron Strucker and the destruction of Hydra Island in STRANGE TALES #158 (July 1967). Another branch of HYDRA was taken out this month in CAPTAIN AMERICA #113 (May 1969). Val last appeared in NICK FURY, AGENT OF SHIELD #5 (October 1968). Val's actions in this story were never adequately explained.
This episode formed the basis of Bob Harras' NICK FURY VS. S.H.I.E.L.D. #1 (June 1988). Not counting covers, this was Barry Smith's fifth story for Marvel; he was replaced in the next issue, apparently, because his green card ran out and he was forced at short notice to return to England. Smith's next Marvel work was in THE AVENGERS #66-67 (July-August 1969). Smith confirmed, via his website, that he inked some pages of this story.
Letters from Rob Levinson, Darrell Newsom, Anthony Kowalik, Terry Black, Donald F. McGregor (future comics writer), Owen Mahon and Eva Jane Rohrer; includes Know Ye These, the Hallowed Ranks of Marveldom.