expression, noun
the wrong hands; hands of evil
Refers to evil or malicious control, often used when something dangerous falls into the wrong hands.
核兵器が悪の手に渡るのを防がなければならない。
We must prevent nuclear weapons from falling into the wrong hands.
その秘密が悪の手に渡れば、大変なことになる。
If that secret falls into the hands of evil, it will be disastrous.