It is a trade unionist strain of Socialism, that is more inclined to form structures and power bases within an existing system than to try to overthrow it. Some of it's followers later morphed their ideologies into Corporatist or Fascist economic strains, but saying Yellow Socialism is Fascist is like saying Marxism is Maoist. It's more syndicalist than anything.
http://en.wikipedia.org/wiki/Yellow_socialism
edit: And a lot of them have ties to various forms of Social Democracy.




