sentences:  A leftist, technologically oriented wing of the movement had formed in Switzerland and the Netherlands, the so-called ABC Group.It was made up of collaborators of El Lissitzky such as Mart Stam and Hannes Meyer, whose greatest work was the glassy expanse of the Van Nelle Factory in Rotterdam.The clean lines of the New Objectivity were also being used for schools and public buildings, by May in Frankfurt, in Hannes Meyer's ADGB Trade Union School in Bernau and Max Taut's Alexander von Humboldt School in Berlin, as well as police administration and office buildings in Berlin under Martin Wagner.