CCC 2269 The fifth commandment forbids doing anything with the intention of indirectly bringing about a person’s death. The moral law prohibits exposing someone to mortal danger without grave reason, as well as refusing assistance to a person in danger.
The acceptance by human society of murderous famines, without efforts to remedy them, is a scandalous injustice and a grave offense. Those whose usurious and avaricious dealings lead to the hunger and death of their brethren in the human family indirectly commit homicide, which is imputable to them.¹
Unintentional killing is not morally imputable. But one is not exonerated from grave offense if, without proportionate reasons, he has acted in a way that brings about someone’s death, even without the intention to do so.

CCC 2409 Even if it does not contradict the provisions of civil law, any form of unjustly taking and keeping the property of others is against the seventh commandment: thus, deliberate retention of goods lent or of objects lost; business fraud; paying unjust wages; forcing up prices by taking advantage of the ignorance or hardship of another.²
The following are also morally illicit: speculation in which one contrives to manipulate the price of goods artificially in order to gain an advantage to the detriment of others; corruption in which one influences the judgment of those who must make decisions according to law; appropriation and use for private purposes of the common goods of an enterprise; work poorly done; tax evasion; forgery of checks and invoices; excessive expenses and waste. Willfully damaging private or public property is contrary to the moral law and requires reparation.

CCC 2449 Beginning with the Old Testament, all kinds of juridical measures (the jubilee year of forgiveness of debts, prohibition of loans at interest and the keeping of collateral, the obligation to tithe, the daily payment of the day-laborer, the right to glean vines and fields) answer the exhortation of Deuteronomy: “For the poor will never cease out of the land; therefore I command you, ‘You shall open wide your hand to your brother, to the needy and to the poor in the land.’”³ Jesus makes these words his own: “The poor you always have with you, but you do not always have me.”⁴ In so doing he does not soften the vehemence of former oracles against “buying the poor for silver and the needy for a pair of sandals. ..,” but invites us to recognize his own presence in the poor who are his brethren:⁵
When her mother reproached her for caring for the poor and the sick at home, St. Rose of Lima said to her: “When we serve the poor and the sick, we serve Jesus. We must not fail to help our neighbors, because in them we serve Jesus.”⁶

1 Cf. Am 8:4-10.
2 Cf. Deut 25:13-16; 24:14-15; Jas 5:4; Am 8:4-6.
3 Deut 15:11.
4 Jn 12:8.
5 Am 8:6; cf. Mt 25:40.
6 P. Hansen, Vita mirabilis (Louvain, 1668).