Dortmund police used pepper spray and batons against demonstrators from the left-wing autonomous scene on Sunday at one of the many rallies taking place in Germany on International Workers’ Day. Demonstrators attacked police officers in the western German city and tried to break through a barrier, a police spokesperson said. A spokeswoman for “Autonomen Antifa 170” complained of police violence and said several participants had been injured. The demonstrators had assembled to protest against a march of about 220 right-wing extremists. At the time of the clash with the police, that march had no…