This is the 3775th most frequent Chinese word.
違法
"Violation of law" or "illegal."
In this sentence, '違法' (illegal) acts as an adjective describing the nature of the behavior being discussed, specifying that it is against the law.
偷税漏税是違法的行為。
Tax evasion is an illegal act.
Here, '違法' functions as a verb meaning 'to break the law' or 'to act against the law.'
如果有人違法，就应该接受法律的制裁。
If someone breaks the law, they should face legal sanctions.
In this sentence, '違法' is used as an adjective modifying 'activities,' indicating these activities are unlawful.