Infringe does not require a preposition when used in the sense of violating a law, regulation or other rule.
- Drivers who infringe traffic laws by running red lights will now be caught on camera.
- I may have infringed the customs regulations when I returned from Europe with so many gifts.
Infringe is followed by on or upon when the intended meaning is to trespass or encroach.
- Parents often infringe on (or upon) their children’s privacy “for their own good.”
- Mandatory drug testing infringes on (or upon) workers’ civil rights, according to labour activists.
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