For more than five years, the planet Rillut had been trying to bring Earth's economy to a grinding halt; it was the only certain way of ensuring the overthrow of the government of Unified Earth. Extremists from both planets planned acts of mass violence to disrupt the body politic, and it was Matt Brisbane's mission to stop them--secretly and alone Also published under the title, Shareworld.
I picked a copy of this up at a discount book store, off of their even further discounted shelf. The story was written in 1972 and it does show its age. Though there were several interesting items that jumped out at me while I was reading it that struck me as rather curious. The biggest and most memorable of these was the indication that the USA and China eventually ended up at war with each other and the outcome was a unified global government that is run as a business and all forms of violence are outlawed. The author's viewpoint in the novel was that neither communism, nor democracy, would win out as a form of government, but capitalism is what ultimately drives, not only the Terran global government, but for the most part, the interstellar relations as well.
Overall, it was an adequate read and if you're looking for something that is different and nostalgic, then this may be the kind of thing you're looking for.