Escorted by a police car, a silver-gray Mercedes carrying General Kriangsak Chomanan passed through the ornate gates of the Armed Forces Supreme Command headquarters in downtown Bangkok last week. Out of habit, the guard on duty saluted. But it was not an occasion to honor the retired general and former Prime Minister, for Kriangsak, 67, was arrested and charged with attempting to overthrow the government of Prime Minister Prem Tinsulanonda on Sept. 9.
As rumors of a post-coup Cabinet shake-up persisted, the Prime Minister began the difficult task of settling accounts. Security forces rounded up four retired generals, including Kriangsak and...