Board Thread:New on Marvel Cinematic Universe Wiki/@comment-24675861-20150907023805/@comment-1276416-20150907042248

From what I gather, Fennhoff was recruited into Leviathan in 1944, in the flashback-scene was saw in the begining of episode 6. He then told Leviathan about the Midnight Oil, and his plan for revenge against Howard Stark. Leviathan saw an opportunity to weaken the morale of the United States by having the citizens of NY kill each other, and putting the blame on one of USA's greatest inventors. So, they suplied Fennhoff with agents like Dottie, Let Brannis and Sasha Demidov. The rest is history.

Thats my head-canon until its disproven.