I'm not a lawyer, however from an European side, I think it really depends on your contract with them. If you are paid as independent/contractor, then they can

I'm not a lawyer, however from an European side, I think it really depends on your contract with them. If you are paid as independent/contractor, then they can probably terminate the contract how they please depending on the conditions which are stipulated on the contract with them. They probably don't need to provide any reasons then. The European governments has foreseen protections (e.g. they can't fire you when you are sick, or notice leave, etc...), but these only apply when you are an employee. I sincerely hope though that you manage to receive a compensation for the wrongdoing they did to you. Like the other poster mentioned, maybe checking out with a lawyer in the US would be the best way to go forward.