Communist East Germany’s secret police saw Michael Jackson as a security threat, fearing his 1988 concert next to the Berlin Wall would spark protests, new archive findings showed on Thursday.

The Stasi was worried youngsters would try to crash through security barriers to listen to the concert on the other side of the wall which had separated East and West Berlin since 1961. They were concerned dissidents would call for the Wall to fall, Steffen Mayer, a spokesman for the government agency that looks after the Stasi archives said.

The Stasi had planned to broadcast the concert in an East Berlin stadium to keep people away from the area. But the plan was never carried out. Instead authorities forcefully dispersed anyone who tried to get close to the wall on June 19.