Mormons often complain about their victim role in American history but a selection of quotes from state of the Union addresses from various presidents shows how concerned the government was and perhaps has reason to continue being. This quote is from Chester A Arthur, 21st American president. For more click through to the American Creation blog.
“The fact that adherents of the Mormon Church, which rests upon polygamy as its corner stone, have recently been peopling in large numbers Idaho, Arizona, and other of our Western Territories is well calculated to excite the liveliest interest and apprehension. It imposes upon Congress and the Executive the duty of arraying against this barbarous system all the power which under the Constitution and the law they can wield for its destruction. Reference has been already made to the obstacles which the United States officers have encountered in their efforts to punish violations of law. Prominent among these obstacles is the difficulty of procuring legal evidence sufficient to warrant a conviction even in the case of the most notorious offenders."