The Greks Bring Gifts was originally published in 1964 and reprinted in paperback in 1968 (the cover above). It is a classic science fiction tale of apparently benevolent aliens who turn out to be not so.
Murray Leinster (pseudonym of William F. Jenkins) was a prolific early science fiction writer with literally hundreds of stories, articles, radio plays, television scripts, and other works. He published his first story in 1916 and his last novel in 1969. He also wrote other genre fiction during the heyday of the pulps and would use variations of William Jenkins if a magazine already had one of his stories under the Leinster name!
His stories include one of the first mentions of a universal translator ("First Contact" 1945) and one of the first descriptions of a computer ("A Logic Called Joe" 1946). He also won a Hugo award for his novelette "Exploration Team" in 1956.
Greks is available on Biblio for as little as $3.97, including shipping.
From the back of The Greks Bring Gifts: They came to Earth in their space ship, bearing fabulous gifts - such as machines that did any day job automatically, and fertilizer that made plants shoot up overnight. But they presented their gifts with contempt, and with a look in their eyes that made people feel "creepy".
Still, because of the brave new world they promised, they Greks could be forgiven anything - until they left and people discovered the machines were breaking down. Then their only choice was to beg the Greks to come back, on their own terms. And they knew the terms would be hard...
Me as a critic (be careful! the harshness will be well concealed!)