Summary

Portrait of William O. Douglas William O. Douglas Cleveland v. United States — Opinion of the Court

It is not my purpose to defend the practice of polygamy or to claim that it is morally the equivalent of monogamy. But it is essential to understand what it is as well as what it is not. Only in that way can we intelligently decide whether it falls within the same genus as prostitution or debauchery.
There are four fundamental forms of marriage: (1) monogamy; (2) polygamy, or one man with several wives; (3) polyandry, or one woman with several husbands; and (4) group marriage. The term 'polygamy' covers both polygyny and polyandry.
Source: Wikisource

Portrait of William O. Douglas William O. Douglas Cleveland v. United States — Opinion of the Court

In short, although recognizing that by silence Congress at times may be taken to acquiesce and thus approve, we should be very sure that, under all the circumstances of a given situation, it has done so before we so rule and thus at once relieve ourselves from and shift to it the burden of correcting what we have done wrongly. The matter is particular, not general, notwithstanding earlier exceptional treatment and more recent tendency. Just as dubious legislative history is at times much overridden, so also is silence or inaction often mistaken for legislation.
Source: Wikisource

Portrait of William O. Douglas William O. Douglas Cleveland v. United States — Opinion of the Court

We must recognize, then, that polygyny, like other forms of marriage, is basically a cultural institution rooted deeply in the religious beliefs and social mores of those societies in which it appears. It is equally true that the briefs and mores of the dominant culture of the contemporary world condemn the practice as immoral and substitute monogamy in its place. To those beliefs and mores I subscribe, but that does not alter the fact that polygyny is a form of marriage built upon a set of social and moral principles.
Source: Wikisource

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