On 17 June 1953, during the East German uprising, in the front seat of his Tatra, East German politician Nuschke, deputy prime minister, and his driver got stuck in an angry mass. Enclosed by them, they were forced to get out but after Nuschke was recognized, had to get back into the car, the Tatra slowly guided across the sector border into West-Berlin, the driver, lacking a view, did not know where they were heading for because of the mass including people on his front bonnet. Some American military recognised him and saved him from the angry masses. He and his driver were brought to a police station, but released on 19 June. After that Nuschke and his driver returned to East Berlin. In a spontaneous interview given to RIAS reporter Peter Schultze, Nuschke claimed that the East German government had popular support and that the demonstrators included West-Berliners.
http://www.jungewelt.de/2013/06-15/010.php
http://en.wikipedia.org/wiki/Otto_Nuschke
P.S. Looking for a photo of the Tatra , I came across documents that Nuschke wasn’t with a Tatra but with an IFA F9. The story is too nice to withdraw however.
http://www.17juni53.de/chronik/530619/doc_3.html