black fog; veil of secrecy; cover-up
Figurative expression for a situation where suspicion, corruption, or unethical acts are hidden from public view. Often used in political or corporate scandals.
The case is shrouded in a black fog of secrecy.
政界の黒い霧を晴らすために調査が行われた。
An investigation was conducted to clear away the black fog in the political world.