With the meeting of President Trump and Kim Jong-un of North Korea on Tuesday in Singapore, human rights groups are watching for Mr. Trump to bring up North Korea’s widespread crimes against humanity.

Mr. Kim rules with extreme brutality, making his nation among the worst human rights violators in the world.

In North Korea, these crimes “entail extermination, murder, enslavement, torture, imprisonment, rape, forced abortions and other sexual violence, persecution on political, religious, racial and gender grounds, the forcible transfer of populations, the enforced disappearance of persons and the inhumane act of knowingly causing prolonged starvation,” concluded a 2014 United Nations report that examined North Korea.

Here are some of the atrocities that have happened there.

A network of prison gulags

Many North Koreans live in fear. That is by design, and it is reinforced by the country’s ruthless police state.