I choose the proverb 'Bad news travels fast'. It means that negative information spreads quickly and widely. People tend to share bad news more readily than good news, leading to its rapid dissemination.
For example, if a company announces layoffs, the news will likely spread through the industry and among job seekers very quickly.
A Russian proverb that expresses a similar idea is: 'Худая слава по миру бежит' (Khudaya slava po miru bezhit), which translates to 'Bad fame runs around the world'.