This question already has an answer here:
In Agents of SHIELD Season 2,
Episode 22 ("SOS Part Two"), Grant Ward is shown taking over Hydra, with a couple goons giving him their allegiance.
Then, in Ant-Man,
former SHIELD bigshot Mitch Carson is revealed to be a Hydra agent, and it is assumed that he has been for some time. He's clearly more of a power broker than a former specialist with a couple goofy henchmen. Also, it's unclear what he could do with the Yellowjacket serum without a team of researchers behind him, so he's probably not a lone wolf.
What's going on here? What's the status of Hydra and who is in charge?