What is the sin opposed to distributive justice ?
It is the sin of the respect of persons (LX III.).
What is meant by this sin?
It is the fact of giving something or of refusing to give to a person what is for his good, or to impose something on a person that is burdensome or difficult, and this not by a consideration of his merits or demerits but merely because the person is such and such a one (LXIII. 1)
Next - The Catechism of the Summa - SECOND SECTION - A DETAILED SURVEY OF MAN'S RETURN TO GOD - XXI. OF THE SINS OPPOSED TO DISTRIBUTIVE JUSTICE: OF THE RESPECT OF PERSONS; OF THE SINS OPPOSED TO COMMUTATIVE JUSTICE; OF HOMICIDE; OF CAPITAL PUNISHMENT; OF MUTILATION; OF FLOGGING; AND OF IMPRISONMENT (B)