Mack Reynolds 
Section G: United Planets 
United Planets

Legally, the United Planets Organization could do nothing about the repressive, backward planetary governments of Falange, Stalin and Doria. It was imperative, however, that something be done. The UP had proof that a race of highly advanced, warlike aliens existed somewhere in the depths of space — the human-held worlds ad to be ready to meet the challenge when it came.For this reason the secret corps, Section G, was formed. No government could be allowed to hold up the progress of mankind; Section G was ordered to bring them down — by any means necessary!