What did the Judaizers accuse Paul of in the Corinthian letters?

Les explains that throughout the Corinthian letters Paul is always defending his apostleship because he was under constant attack primarily by the Judaizers. They charged that he was an imposter, that he had turned his back, and that he was a turncoat against the traditions of the Fathers. They further argued he did not have the authority Peter had, since he had not walked with Christ for three years as Peter did. Paul was therefore under attack for both reasonings: being a turncoat to Judaism and lacking the authority of Peter and the twelve. Les notes Paul always comes back to this defense, and even as he goes into Galatians, he will declare that he was an apostle not declared such by any group of men, but by God Himself.