Q. 1. Is it true that there are sins that cry out to Heaven?

A. 1. Yes. The Catholic Church teaches that there are 4 Sins that cry out to Heaven.

Q. 2. What are these sins?

A. 2. They are:

Willful murder (See Genesis 4.)

The sin of Sodom (see Genesis 18)

Oppression of the poor (See Exodus 2)

Defrauding laborers of their wages (See James 5)