They don't want him to go out. He's been in jail for more than 20 years now and the maximum rule is to keep him inside a cell.

VOA: standard.2010.07.07

If I don't, I get locked in jail or they tell me to get out of the country.

如果不缴税，我会被关到监狱,或者被驱逐出境。

耶鲁公开课 - 公正课程节选