 Complete the following phrase:  After 30 September Movement botch military operation, many people including university students and lecturers had to be interrogated, and proved themselves non-communist by the university. To carry on this operation the university involved student, especially from HMI which was a rival of leftist students union such as CGMI to inform the campus about lecturers or students who are communists or affiliated with leftist organizations. Many of the students and lecturers were expelled, became political prisoners, or 