A. Legal verbs

to bend the law/rules: to break the law/rules in a way that is considered not to be very harmful
to contravene a law: to break a law (noun = contravention)
to infringe a law/rule: to break a law/rule (noun = infringement)
to impeach a president/governor: to make a formal statement saying that a person in public office has committed a serious offence (noun = impeachment)
to lodge an appeal: to make an official request that a previous judgement should be changed
to uphold/overturn a verdict: to say that a previous decision in court was correct/incorrect
to pervert the course of justice: to make it difficult for justice to be done (noun = perversion)
to quash a conviction: to change a previous official decision that someone was guilty
to set a precedent: to establish a decision which must usually, in English law, be taken into account in future cases
to award/grant custody to: to give one parent or adult the main responsibility for a child, especially after separation or divorce
to annul a(n) agreement/marriage/law: to declare that it no longer exists and never existed (noun = annulment)
to sue someone: to take legal action against someone
to allege /əˈliːdʒ/: to say that someone has done something illegal without giving proof (noun = allegation)
to amend a law: to make changes to a law (noun = amendment)

B. Crimes

Crime	Meaning	Verb	Criminal
discrimination	unfair treatment on grounds of sex, race or nationality	discriminate (against)	——
embezzlement	stealing money that belongs to an organisation that you work for	embezzle	embezzler
harassment	putting undue pressure on someone, e.g. for sexual reasons or to get a debt repaid	harass	——
insider trading/dealing	illegal buying and selling of shares by someone who has specialist knowledge of a company	do/practise insider trading/dealing	insider trader/dealer
money laundering	moving money obtained illegally so that its origin cannot be traced	launder money	money launderer
perjury	lying when under oath	commit perjury	perjurer
stalking	following someone or giving them unwanted or obsessive attention	stalk	stalker
trespass/trespassing	go onto someone else’s land without permission	trespass	trespasser

A law-abiding person is someone who always obeys the law.
A law-breaker is someone who – often deliberately – does not obey the law.
If you take the law into your own hands, you do something illegal to punish someone because you feel the legal system will not punish that person.
If you lay down the law, you say with great force what you think should happen.
If someone is a law unto himself/herself, he or she behaves in a way which is independent and not the way in which most other people behave.