SF. Ace Double- Robert Silverberg "Master of Life and Death" / James White "The Secret Visitors"

The Secret Visitors - James White.

When the World Security Organization asked Doctor Lockhart to treat their mysterious prisoner, they hadn't known that the dying old man would reply to their questions in a totally unknown language.  They had expected the stranger to reveal some connection between himself and the world war which seemed imminent.  They had been thinking in terms of foreign spies - not alien beings.

Master of Life and Death - Robert Silverberg.

By the 23rd Century Earth's population had reached seven billion and Mankind was in danger of perishing for lack of elbow room unless prompt measures were taken.   Roy Walton had the power to enforce those measures and found himself the most hated man on Earth.  It was his job to tell parents their children were unfit to live and he had to uproot people from their homes and send them to remote areas. 

A 1957 Ace paperback in fair to good condition based on the Hancer Standard.