 Complete the following phrase:  Wilhelm Knöchel was born into a Social Democratic working class family in Offenbach, a short distance upriver from Frankfurt. He qualified and worked as a factory machine operator Dreher. In 1917 he was conscripted into the Imperial Army, shortly after which he was badly wounded. There are also references to his having worked as a mines maintece engineer Grubenschlosser. In 1919, with Germany affected by acute economic hardship and, especially in the cities, a 