I am the original poster. It seems like training centers such as Keyword are being targeted by the police or immigration officials for hiring illegal workers, which are people without the proper Z-Visa and work permit. The situation at these training centers, and maybe other schools as well, is getting intense. Foreign teachers are being told to literally go back to their home country after flying all the way to China only to have their work permits and residence permits DENIED. Some training centers are still hiring people illegally, people with tourist, student, business, or other non-work visas are told they can come teach English. Simply trying to transfer your work permit to another job is also a complicated process. For a long time people could work on the wrong visa in China, but now China is enforcing the policy more in big cities.