Murray Leinster 
Pariah Planet (Serapis Classics) 

When the blue plague appeared on the planet of Dara, fear struck nearby worlds. The fear led to a hate that threatened the lives of millions and endangered the Galactic peace. ________ Murray Leinster was a nom de plume of William Fitzgerald Jenkins, an American writer of science fiction and alternate history literature. He wrote and published more than 1, 500 short stories and articles, 14 movie scripts, and hundreds of radio scripts and television plays.