Joseph, I think most CR readers know that, but some K’s have legitimate kashrus organizations behind them. For instance, Kellogg’s cereals has the Vaad of Massachusetts (weird, because Kellogg’s is based in Michigan). I seem to remember some Kraft products had a K that was the OK. Other K’s, like the one on Jello gelatin, are not backed by mainstream hashgachas.
As for the original question, I believe that today many Ralston products are under the OV, which is a St. Louis hashgacha. If you see a store-brand cereal with the OV, it probably was made by Ralston.