what is hydra and who is red skull.

who's HYDRA and red skull in the marvel cinematic universe: in the mcu HYDRA is a gang that wanted to destroy the avengers so it can have the control over the world. Red skull(Johann Schmidt) aka the host of hydra hated the avengers so much to the fact that he wanted to kill them so bad but obviously failed at it. he actually first appeared in captain america the first avenger,

and last appeared in the avengers endgame,he was the keeper of the soul stone

which frankly shocked all the marvel fans and the question that run in every marvel fan mind is what happened to red skull and how did he became the keeper of the soul stone. unfortunately we dont know that yet, marvel have yet to give us the answer.i bet they forgot about it.Actually HYDRA'S logo:

skeleton and octopus with the color "red"which mostly represents that its evil, deadly, dangerous, etc... In the mcu hydra was famous by its unimaginable weapons. what made it special is that it had the mind stone,one of THE most powerful weapons not only on earth but in the whole wide universe. And in avengers age of ultron ironman took the mind stone after the avengers attacked HYDRA'S hideout,not knowing that HYDRA had the twins aka wanda maximoff(scarlet witch) and pietro maximoff(quicksilver).Disappointedly they didnt do much because they didnt want the avengers to know that they exist ,yet, cz they had a plan(an incredibly bad plan) .though we havent seen hydra in the mcu again since avengers age of ultron.