The labor of a human being is not a commodity or article of commerce, and the right to enter into the relation of employer and employee, or the right to change that relation; or to assume and create a new relation for employer and employee; or to perform and carry on business with any person in any place; or to work and labor as an employee, shall be held and construed to be a personal, and not a property, right. In all cases involving the violation of the contract of employment, either by the employee or employer, where no irreparable damage is about to be committed upon the property or property right of either, no injunction shall be granted, but the parties shall be left to their remedy at law.