A lower court acquitted the group but a retrial in a higher court of Wuppertal led to a guilty verdict for all seven men, aged 27 to 37, according to the Rheinische Post newspaper. Their lawyers said they would appeal.
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The men were reportedly fined between 300 euros ($336) and 1,800 euros ($2,015). The court proved they knowingly invoked the image of a violent militant Islamist group that enforced strict Islamic laws.
The suspects filmed themselves wearing fluorescent vests that bore the sign of "Shariah police." They patrolled the streets of Wuppertal and handed out pamphlets on the norms of conduct in the city, which forbade drinking and gambling.