illegal act

基本解释

He called it an unprecedented illegal act.
他说，这是史无前例的非法行为。
This animal was shot—an illegal act—while it was raiding a rice field near the park.
这头大象是在公园附近的稻田搞破坏时被人打了一枪，这种伤害大象的行为是违法的。
But Serbia and Russia reacted immediately to what they consider an illegal act backed by the international community.
但是塞尔维亚和俄罗斯认为，科索沃宣布独立是在国际社会支持下的非法行为，并且马上对此作出了反应。

Police Colonel Omidi insists that Iranian government authorities will intervene in political matters on the Internet if there has been an illegal act.
In other words, as the judge said, what's always moral isn't necessarily against the law and while I don't think that necessity justifies theft or murder or any illegal act, at some point your degree of necessity does, in fact, exonerate you from any guilt.
换言之，正如法官常说的，情有可原，未必不可法外容情,当然我不认为，一句情有可原,就能为盗窃，谋杀以及其他违法行为正名，但有时，情有可原的程度,确实可能法外容情，赦免你的罪行。
耶鲁公开课 - 公正课程节选

An illegal act of defiance for which he was found innocent, as often happens.
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"Malfeasance" suggests wrongful doing, as in an individual intentionally performing an illegal act.
FORBES: Magazine Article

违法行为
The meaning of “ultima ratio of penalty” means that thecriminal law should be regarded as the last defense to punish the illegal act.
所谓刑法谦抑,是指刑法应当作为抗制社会违法行为的最后一道防线,应根据一定的规则控制处罚范围与处罚程度。
不法行为