Right now, if you look up "ISIS slave" on Wikipedia, you get an interesting article called "Slavery in 21st-century jihadism." The article lede currently starts with the following:

Quasi-state-level jihadist groups, including Boko Haram and the Islamic State of Iraq and the Levant, have captured and enslaved women and children, often for sexual slavery.[1][2] In 2014 in particular, both groups organised mass kidnappings of large numbers of girls and younger women.[3][4]

The article suggests that the crime of slavery (or forced labor, although there is very little distinction between the two when talking about totalitarian quasi-states like ISIS) is only perpetrated against women and children. Even when scrolling to the ISIS section, we get three paragraphs (as of the time that this post was made) that exclusively cover sexual slavery, or enslavement of women/children.

Also, there seems to be an undue focus on girls kidnapped by Boko Haram, while over 10k boys have been kidnapped by them and have been labelled "iredeemable" by Nigerian officials.

The documentary that I will share contains a lot of graphic footage of war (but I won't link those parts). If you cannot handle seeing these images/descriptions then I recommend that you stop reading this post now.

Here is an eye-opening ISIS documentary showing a chain-gang of 15 Syrian male POWs(?) being worked to death. The slaves are working for 15 hours per day at 40C temperature. In EU member states, the safe working temperature maximum varies between 28C to 36C, and the maximum working hours is 48 hours per week. They are tasked with digging a long inghimasi tunnel behind enemy lines so that the slaves can eventually blow themselves up. You can clearly see the sweat covering their faces and them nervously breaking eye contact as they are being questioned by the reporter. They know that they are digging their own graves, be it figuratively or even literally.

In the same documentary you can see a condemned man forced to make improvised artillery shells for ISIS (presumably until he gets executed when he's no longer useful, just like the detainees at Nazi KZs). The man behind him jokingly makes a beheading motion (the method of execution for most detainees "convicted" by their Islamic courts)

Here is another article about ISIS slavery by Human Rights Watch... except the article only talks about sex slavery and slavery of women. There is no mention of child soldiers, involuntary suicide bombers or indentured tunnel-diggers

Are you surprised at how misandrist the media/NGOs are?

Here is another slavery-related MR post: "The gender part of African slavery you don't know hear about in school: men were more enslaved, female slaves were freed more, and some slave owners were women."