Pew Charitable Trusts has a lot more money than the local fishing industry - most of it from oil.  This isn't "small people" standing up to a large institution.

Meanwhile, labor issues in the longline fishery might be a real problem, but it doesn't have anything to do with the monument expansion.  Their hiring practices will continue regardless of where they're allowed to fish.  If it's an issue, it can (and should) be dealt with separately.