As used in constitutional law, this right includes personal freedom, freedom of contract, exemption from oppression or invidious discrimination, the right to follow one’s individual preference in the choice of an occupation and the application of his energies, liberty of conscience, and the right to enjoy the domestic relations and the privileges of the family and the home. Black, Const. Law (3d Ed.) p. 544. See Ruhstrat v. People, 185 111. 133, 57 N. E. 41, 49 L R. A. 181, 76 Am. St. Rep. 30; Hooper v. California, 105 U. S. 648, 15 S. Ct. 207, 39 L. Ed. 297; Butchers’ Union, etc., Co. v. Crescent City Live Stock, etc., Co., Ill U. S. 740, 4 Sup. Ct. 652, 28 L. Ed. 585.