ex-con

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++ˌex-ˈcon noun [countable] informal  a criminal who has been in prison but who is now free 坐过牢的人，蹲过监狱的人

Examples from the Corpus

ex-con• The disclosures have led to firings, assaults and other forms of harassment against the parolees and ex-cons.• Horror stories are rife of ex-cons setting up their own security companies, with all the obvious risks that entails.• At last all seems to be coming together for the ex-con who wants to go straight.

ˌex-ˈcon nounChineseSyllable  

in prison has Corpus a but criminal who been

ex-con
ˌex-ˈcon noun [countable] informal
a criminal who has been in prison but who is now free