He says each of the four have been using modern computer sciences and very aggressive scaling approaches to get large.

FORBES: Connect

The new U.S. strategy also calls for a more aggressive diplomatic response to the theft of trade secrets, much of which is now done by infiltrating computer networks of target companies.

WSJ: U.S. Ups Ante for Spying on Firms: China, Others Are Threatened With Penalties

The new U.S. strategy also calls for a more aggressive diplomatic response to the theft of trade secrets, much of which is now done by infiltrating computer networks of target companies but some is also still done by recruiting human spies.

WSJ: U.S. Unveils New Strategy to Combat Trade-Secret Theft