What were the Galatian churches doing that Galatians was written to correct?
The Galatian churches were going back under legalism. Galatians was written to that group of churches up in Asia Minor, called Galatia, which was central Turkey, for the precise purpose of correcting that return to legalism. This correction concerned their going back under legalism.
Les explains that Galatians was written to the group of churches in Asia Minor, which was called Galatia and was located in central Turkey. In his review and background, he states that the precise purpose of the letter was to correct their going back under legalism. He introduces this as background before beginning the study in Galatians 4:1.