Mack Reynolds 
Black Man’s Burden [EPUB ebook] 

Posing as low-caste itinerant smiths selling wares, the all-black fieldworkers of the Reunited Nations team led by sociologist Dr. Homer Crawford travel the Sahara subtly subverting the culture of its nomad tribes by disseminating ‘progressive’ Western propaganda such as the right to equality, liberty, and the pursuit of happiness with the long-term objective of leading North Africa into the modern age. Knowing the peoples they encounter may label their teachings as blasphemous, the fieldworkers attribute them to El Hassan, an imaginary leader who has incorporated the wisdom of all the sages and prophets of the world. On their way back from working at a Tuareg encampment, the fieldworkers are attacked by an Arab Union convoy trespassing on Reunited Nations territory and, in defending themselves, kill all the Arab troopers…