Zài nà duàn kǒngbù shíqī, shèhuì shàng rénrénzìwēi.
During that reign of terror, everyone in society feared for themselves.
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history
From Sima Qian's 《史记·李斯列传》 (Han dynasty): under the harsh laws of Qin, 群臣人人自危 - every official feared for himself, and many sought to defect. One of the great phrases for political terror, with us since Western Han.
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Heavy and political - used for purges, crackdowns, mass layoffs, plagues, or any climate where people no longer feel safe. Avoid for ordinary nervousness.