If everyone with a secret bank account were busted, a lot of people would be in trouble.
この場合、次のような言い方ができると思います。
ーIf everyone with a secret bank account were busted, a lot of people would be in trouble.
「隠し口座を持つだれもかれもがバレたら、困る人が多いだろう」
隠し口座は a hidden bank account とも言えます。
ご参考まで!