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corruption (of order, public morals, etc.); subversion; degradation
collapse (of an organization, system, etc.); falling apart
社会の秩序を壊乱する行為だ。
It's an act that corrupts social order.
風紀が壊乱している状況だった。
It was a situation where morals had broken down.
壊乱した治安を回復させた。
The disrupted public order was restored.