The use of the word “Justice” outside a legal context is usually used by leftists to promote some radical program.
The left has a distorted idea of justice. “Justice” is not coercing money from the producers to give to able-bodied lazy morons. Real justice is getting what you earn, not what you think you are entitled to.
Justice to liberals means getting whatever they want and having someone else pay for it. Another older word for that fits the liberal definition of justice is "theft" or maybe "robbery"