Slavery and Islam have been linked institutions since the Prophet Mohammed stepped onto the scene and allegedly uttered the words that were taken down and became the Qur-an. (Mohammed was illiterate). Recently we've seen a resurgence of slavery in Islamic lands and advocacy for the practice as set forth in the Wikipedia citation below (Search Criteria: Islamic Views on Slavery)
In recent years, according to some scholars, there has been a "reopening" of the issue of slavery by some conservative Salafi Islamic scholars after its "closing" earlier in the 20th century when Muslim countries banned slavery and "most Muslim scholars" found the practice "inconsistent with Qur'anic morality."
In 2003 in what one scholar called a "ominous and disturbing development" a high-level Saudi jurist, Shaykh Saleh Al-Fawzan, issued a fatwa claiming “Slavery is a part of Islam. Slavery is part of jihad, and jihad will remain as long there is Islam.” He attacked Muslim scholars who said otherwise maintaining they were "infidels" and “ignorant, not scholars.” At the time of the fatwa, al-Fawzan was a member of the Senior Council of Clerics, Saudi Arabia’s highest religious body, a member of the Council of Religious Edicts and Research, the Imam of Prince Mitaeb Mosque in Riyadh, and a professor at Imam Mohamed Bin Saud Islamic University, the main Wahhabi center of learning in the country.
According to multiple sources, religious calls have also been made to capture and enslave Jewish women. As American journalist John J. Miller said, "It is hard to imagine a serious person calling for America to enslave its enemies. Yet a prominent Saudi cleric, Shaikh Saad Al-Buraik, recently urged Palestinians to do exactly that with Jews: 'Their women are yours to take, legitimately. God made them yours. Why don't you enslave their women?'" 
I find it ironic that Barack, who harps on the institution of slavery in America's past endlessly, would have such fondness for Islam. That feeling extends to all black Americans who are angry at that institution, and feel as if they have an axe to grind - including the Nation of Islam (a black organization in America). Has candidate Hillary Clinton said a single word about the Islamic practice of keeping sex slaves? No outrage there?
We know that the savages in ISIS practice slavery, particularly as it applies to female sex slaves (which is allowed and encouraged by the Quar-an) and yet I have heard scant international outrage at the practice. Even liberal rags such as the New York Times have covered the practice (read here).
In its official publications, the Islamic State has stated that it is legal for a man to rape the women he enslaves under just about any circumstance. Even sex with a child is permissible, according to a pamphlet published by the group. The injunction against raping a pregnant slave is functionally the only protection for the captured women.It's illegal to criticize Islam in Great Britain and Canada -- called "hate speech". How convenient?