Injustice

1. Violation of another's rights or of what is right; lack of justice.

2. A specific unjust act; a wrong.

Synonyms: These nouns denote acts or conditions that cause people to suffer hardship or loss undeservedly. An injustice is a violation of a person's rights; the term can also refer to unfair treatment of another or others: "Injustice anywhere is a threat to justice everywhere" (Martin Luther King, Jr.)
An injury is an injustice for which legal redress is available: The court awarded the plaintiff compensation for the injury to his property.
Wrong is now more emphatic than injustice and in a legal sense refers to what violates the rights of an individual or adversely affects the public welfare: "The age of chivalry is never past, so long as there is a wrong left unredressed on earth" (Charles Kingsley).
A grievance is regarded by those involved as a wrong that affords cause for complaint: The warden addressed the inmates' grievances.