the wrong hands; hands of evil
Refers to evil or malicious control, often used when something dangerous falls into the wrong hands.
We must prevent nuclear weapons from falling into the wrong hands.
If that secret falls into the hands of evil, it will be disastrous.
Compound of 悪 (evil) + の (possessive particle) + 手 (hand). The exact historical derivation is uncertain; the phrase is conventionally associated with the idea of evil or malicious control.