Meanings of knows into in English

Who knows into what folly religious fervour may lead the Trappist?

Who knows into what hands similar documents may have fallen?

Poor creatures, who knows into what hands they might fall!

Who knows into what an agony of fear and remorse and black despair she fell?

Booby puts all she knows into her flight, but vainly; escape is impossible, so with a despairing shriek she drops her load.

Subconsciously it's the feeling of economical dependence, the dread of ultimate poverty, which has driven half the untrained women one knows into unhappy marriages.

"You don't suppose he's going to let everyone he knows into a rehearsal, do you?"