My husband was offered a ft perm job twice by a company and had accepted and then was told the company could not hire him. They brought him back 3 times by contract and in the mean time hired 2 men with same qualifications?

• Aug 2013- hired temporarily for a shutdown
• Dec 2013- hired temporarily for shutdown
• Feb 6 2014-offered and accepted permanent FT job
• Feb 11, 2014-Offer taken away because they needed to interview more people
• another person hired for position
• May 2014-called in to fix a machine from May 3-9, 2014
• June 2014-hired by contract for ft work,
• July 2014-told that due to budget constraints could not hire.
• Oct 9-Jan 2 hired for weekends by contract
• Nov 16, 2014-walked off job because another person was hired ft again before me without any notice from management.

In the US?
There is federal law, state law, union protections if a union, and published company policy, if any.
Was any paperwork signed on 2/6/14, and was he an employee for five days?
What does 'hired by contract for ft work' mean in light of being told a month later that they could not hire? A ft temporary contract that might lead to being offered a job?
Was the most recent contract supposed to result in a wage position too?
Just from what you have written, I don't see any recourse. You may want to talk over the phone with a labor lawyer, because a lot more info is needed.
I don't see that the employer was under any obligation to give any notice to a contract worker before hiring anyone else, unless there were promises made, hopefully in writing. Verbal promises would be hard to prove.

'Same qualifications' doesn't really speak to all that goes into a job offer. The big one is how much they can get away with paying. If your husband's past salaries were pretty high, that can work against him. His health can work against him. Smoking, getting along with others, taking direction well... anything except race and gender and the other civil rights.

So much depends on where you live, and where job is at.

Is there a union, was any of the job offers in writing.