Violate is usually a transitive verb followed directly by an object. In and by may appear in related phrases, but they are not normally fixed prepositions after violate.
The normal structure is violate a rule, violate the law, or violate someone's rights. By often introduces the method in passive or explanatory phrases. In usually introduces the area or context where the violation happens.
These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.
Use violate directly with the law, agreement, right, or standard that is broken.
By introduces the person, action, or thing responsible for the violation.
In introduces the context where the violation occurred. It is not a fixed preposition after violate.
The same subject can take different constructions because each sentence answers a different question.
Some combinations appear in real text but do not mean what learners often assume.
Violate usually takes a direct object.
✕ They violated against the law. ✓ They violated the law.By does not replace the thing that was violated.
✕ They violated by the contract. ✓ They violated the contract.In is optional and adds context only.
✕ They violated in the policy. ✓ They violated the policy.Choose the expression that matches the intended meaning.
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Usually no. Violate is commonly followed directly by an object such as violate the law or violate an agreement.
By is common in passive structures or when explaining the method of violation.
Yes, but in usually introduces the place or context where the violation happened rather than forming a fixed phrase with violate.
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