Not even close. The Sherman Act defines a monopoly in such a way that a single sell must have 67% of the market. As to supporting the Commies, true, Walmart throws them a lot of business. However, if you're following what's going on inside China, this new-found wealth in China is posing severe problems to the Communist model. Finally, I'm tired of seeing union commercials that infer I'm a bad person for buying at a store that sells more cheaply than other stores. Trust me, the union's not going to help domestic companies compete in the world market, and that's what the current economic system is all about.
In my mind, I fail to see much difference between the unions' model of labor fighting management and the Communist model of the the proletariat (worker) fighting the bourgeoisie (management).
A lot of companies get their stuff from China.. Even the mom and pop stores.