lds still practice polygamy, they hide it by calling it celestial marriage.
Oh and by looking the other way with their members are polygamist.
One thing I noticed from studying polygamy in the US is that the Mormon Church doesn’t wink at things. If they tell you to do something, they expect you to do it. When they outlawed polygamy, they told the polygamists to go away. “Go to Canada or Mexico but you no longer exist in our eyes.”