Board Thread:Questions and Answers/@comment-394774-20150224185718/@comment-74.10.65.138-20150224204308

Setting aside that it's kinda hard to tell when *everything* in most comics is written in all caps, the Marvel Wiki seems to disagree:

http://marvel.wikia.com/Hydra_(Earth-616)

Wikipedia uses mixed case and says (citing the Official Handbook of the Marvel Universe as reference):

Though often capitalized, the name is not an acronym but rather a reference to the mythical Lernaean Hydra, and Marvel's Official Handbook of the Marvel Universe hardcover presents it as Hydra.

http://en.wikipedia.org/wiki/Hydra_(comics)

Are there any examples you can find that support all caps, especially for the MCU in particular?