Originally posted by sh76
That's a good point and certainly state laws do apply in national parks within their boundaries.
Still, under the supremacy clause, if Congress specifically allowed a certain conduct in a national park, it's questionable as to whether the state would be able to ban it.
That isn't what Congress did here; it used the Congressional Review Act to overturn an administrative rule passed last year. Info on the CRA (passed in 1996 but only used once before this January) is here: https://en.wikipedia.org/wiki/Congressional_Review_Act
Presumably, States could pass laws banning such practices. I think there's a good chance that Alaska and other States will.
EDIT: Seems like the reality is a bit more complicated:
Young's bill would repeal a regulation finalized in August by the Fish and Wildlife Service. It applies only to federal refuges in Alaska. A similar rule issued by the National Park Service, also for Alaska, was completed too long ago to be repealed. The dispute between Alaska's federal workers and the state Department of Fish and Game managers centers around control of predators like wolves and bears.
https://www.adn.com/politics/2017/02/16/u-s-house-passes-rep-don-youngs-bill-to-repeal-alaska-wildlife-management-regulation/
So the rule against these practices in National Parks will stand.
EDIT2: As the Alaska Dispatch News points out, this debate gets to the core of a long-running dispute:
"At the heart of the disagreement between state and federal wildlife managers is what each group thinks should guide its purpose. The federal government has argued that the goal on refuges and in parks should be biodiversity. The state Board of Game has an interest in ensuring maximum sustained populations for hunting."
Ensuring the "maximum sustained populations" of commonly hunted prey species like elk, moose and caribou often means reining in the populations of their predators — namely, bears and wolves. In the 2016 restrictions, federal regulators argued that the Alaskan Board of Game had gone too far in prioritizing the populations of prey species over predators.
http://www.npr.org/sections/thetwo-way/2017/03/22/521089304/congress-rolls-back-obama-era-rule-on-hunting-bears-and-wolves-in-alaska