Ok, so this isn't a BMW it's actually a Mercedes Benz. Though the Baader-Meinhof Gang stole as many Mercedes as BMWs, they were forever linked to the Bavarian cars in part because of the popular reworking of its name from Bayerische Motoren Werke to Baader Meinhof Wagen. During their rein of terror police would periodically set up road blocks and stop only passing BMWs. Often the gang members would be able to drive unmolested past the roadblocks in their freshly stolen Mercedes. Frustrated BMW owners took to placing bumper stickers on their cars indicating to police that the driver was not, in fact, a member of the Baader-Meinhof Gang.
"I do not belong to the Baader-Meinhof Group"
