I'll never forget descriptions of dangerous wild pigs in the book The Thorn Birds. Shudder.
Here's another from Polk County Wisconsin:
The population in Wisconsin is suspected of having bred with some Russian stock that was illegally smuggled into the state and for some reason released into the wild.
In any event in WI all one needs is a small game license available to non-residents for $85.00 and you can shoot all of them you please.
The WI DNR and local farmers will appreciate your efforts.
L