Any individual or any individuals?
Solution 1:
You can say any of those constructs and they'll be grammatically correct. Still, the emphasis changes.
When you say any individual you actually don't care about which one of the individuals you refer to. But when you say any individuals you it doesn't matter for the speaker how many individuals, but what matters that number of those individuals will be positive.
I think, of course, what was actually meant, that "All individuals will feel the full weight of justice".