“Polygamy has always been odious among the northern and western nations of Europe, and, until the establishment of the Mormon Church, was almost exclusively a feature of the life of Asiatic and of African people. At common law, the second marriage was always void (2 Kent, Com. 79), and from the earliest history of England, polygamy has been treated as an offence against society.”
Reynolds vs the US.
Reynolds goes on to state:
“the legislature of that State substantially enacted the statute of James I., death penalty included, because, as recited in the preamble, “it hath been doubted whether bigamy or poligamy be punishable by the laws of this Commonwealth.” 12 Hening’s Stat. 691. From that day to this, we think it may safely be said there never has been a time in any State of the Union when polygamy has not been an offence against society, cognizable by the civil courts and punishable with more or less severity.”
http://supreme.justia.com/cases/federal/us/98/145/case.html
Reynolds again:
“In the face of all this evidence, it is impossible to believe that the constitutional guaranty of religious freedom was intended to prohibit legislation in respect to this most important feature of social life. Marriage, while from its very nature a sacred obligation, is nevertheless, in most civilized nations, a civil contract, and usually regulated by law. Upon it society may be said to be built, and out of its fruits spring social relations and social obligations and duties with which government is necessarily required to deal.”
I don’t believe in polygamy as most people don’t. But taking it to court didn’t really accomplish anything in my opinion. Some of the FDLDS still do it. They even have a reality TV show! It is morally wrong in my opinion but I don’t think it should be punishable by the gov’t, leave it to God.