This led to his forceful disenrollment from the university shortly before graduation and his expulsion from the Socialist Unity Party of Germany in 1975.
In the summer of 1975 the family moved to Berlin where Fuchs became a social worker in a church charity, one of the few work options for a political dissident.
Fuchs spent 9 months in prison of the East German secret service Stasi in Berlin-Hohenschönhausen (but he was not sentenced until 1982).
Following international protests, Fuchs was released from prison and deported to West Berlin together with his family in August 1977.
After the opening of the Berlin Wall in 1989 and German unification in 1990, Fuchs was an activist in the clarification of the Stasi crimes.