I propose the following rewordings, seem clearer to me. Italics on differences when not obvious.
Hired Assassin Action-Attack-Hireling
Reveal an Action card from your hand. Each other player reveals his hand and trashes all copies of it.
Hired Bandit Action-Attack-Hireling
Each other player reveals the bottom card of his deck. If it costs between $3 and $6, he trashes it, otherwise, he puts it back.
You may gain any of the trashed cards that are not Victory cards.
(it is not clear to me whether you may gain any number or at most one. if it is any number, I would say any number, if it is just one, I would say up to one)
Hired Recruiter Action-Hireling
gain a Hireling or Attack card.
(note that this is different, even if there are no Attacks or no Hirelings, but not both, I cannot choose to gain nothing, while I can do that with your wording. Minor detail to me)
Hired Stalker Action-Hireling
The player to your left reveals his hand. You may choose an Action card from it and gain a copy of it.
Hired Street Toughs Action-Attack-Hireling
Each player (including you) reveals his hand.
Each other player discards a copy of a card in your hand that you choose.
With respect to the effects, they seem super powerful, especially Assassin and Street Toughs. Since they are so easy to chain (a la Torturer), but will never stop Attacking like Torturer, it seems to me that it may be hard to make progress. They don't even eliminate themselves like Knights do. I would tune the Attacking ones down a bit. Note that gaining a card is roughly similar in power to trashing one copy of it from everyone else, but Assassin trashes every copy, and it does so from the hand, so it also reduces handsize. And with many of this making people reveal their hands, it won't be so hard to know what to reveal. Seems to me those attacking hirelings are a bit too much "win more" kind of card. When you have enough of an engine to play them while revealing good cards, you stop everyone shut forever.
EDIT: Let me clarify by saying I really some of the ideas and the pile seems creative. And the art is great. Just commenting on the parts that can be improved, don't take it the wrong way. Also, it seems by the expansion symbol that it should be called "Dominion: Turkey". If you are going to call it Corruption, maybe use something not associated with a particular group of people.