I assume Government uses eminent domain to build on border land, which in likelihood, is mostly private.
I don’t want to be negative, but how can private 501 C do that?
See: Kelo v. City of New London
You don’t need eminent domain for property owners who want a wall on their property.
Once those landowners opt in and get a bollard wall, the human traffic will shift onto non walled property who then may decide they want a wall also.
It’s a great idea and I hope there is a high opt in rate.
“how can private 501 C do that?”
Obviously, they can not exercise eminent domain.
As a 501 C 4, they could spend the money to build some walls on private property, which the government will not maintain.
They could also spend the money on lobbying, instead of building.
If, as a 501 C 4, they are found transferring substantial wealth to someone controlling it, they will have to pay a steep excise tax on those transfers. But they can do it, and it would clearly pay well.