They are the ones who show up at local political fundraising galas and constantly report local issues influencing municipal/state priorities.

Although it's not just NIMBY. There's a million rules about building housing and developing land from zoning, environmental, indigenous, or social ends. Which are arguably luxury self-benefiting priorities for people who already own houses. Plus all the activists who think the government can both make development extremely expensive via endless rules while affording to fund mass government housing at the same time.