Ohio - contractor - fired for a "quiet please, work area" sign

Wanting to know if there are legal actions I can take.

To give you a little background first, my coworker and I are software engineers, contracting through an agency to a very large company in Cincinnati, Ohio.

Coworker and I sit by the doorway into the hallway. It gets very very loud at times in the hallway with people talking and laughing.

There are times that Coworker and I cannot hear someone on the phone because it is that loud. We can't even talk to each other.

Coworker sent out an email asking if he and I could be moved away from the doorway. We haven't heard anything, so Mike printed up a couple of signs that said "Quiet please...people at work"

This afternoon, some guy that Coworker and I have never seen before comes over to the signs, and very angrily starts to tear the signs off. He comes over to us, stops at Coworker's desk, and asked, "Did you put these up?" Coworker says yes, he did, and starts to explain to this guy why he did it.

The guy interupts Coworker and says, "Don't do this again, we don't do these things here" in a very threatening tone of voice, while waving the signs in Coworker's face. Coworker again tries to explain that he sent out an email, that it gets loud, and the guy says "who gets loud?"

I answer him by saying "anyone who is standing by the doorway talking gets loud". The whole time, I just sat in my chair, and this sentance is the only thing I said.

Then Coworker again starts to tell him that the signs are just so that people realize that we are working and to try and keep it down. The guy then repeats, angrily, "talk to your supervisor about it, don't do this again, we don't do this here" He then walks away.

A few of the people around us come over and said things like, "oh my god, I can't believe how that guy acted."

About 20 minutes later, our Supervisor walks over and says, "I heard you had a confrontation". Coworker tells him what happened. Our Supervisor says that the guy is the head of security, told us that he had a bad temper, and that he was informed to get our badges and escort us out of the building.

I asked, "for tomorrow, or for good?" Our Supervisor said for good. He then said that he was going to have a meeting tomorrow after this guy had a chance to calm down to talk to him. He said that Coworker and I were doing good and important work for them, and that he would try to get us back on. I then left. This head of security treated us like children being scolded, never said who he was, and treated us in the most unprofessional manner that I've ever been treated.

The meeting was held, and the company said no, we can't come back to work.

Are you an at-will employee? If yes than I would say that you don't have a cause of action. But feel free to consult with an attorney.