Passage: To prevent this development, the union leaders under Carl Legien and the representatives of big industry under Hugo Stinnes and Carl Friedrich von Siemens met in Berlin from 9 to 12 November. On 15 November, they signed an agreement with advantages for both sides: the union representatives promised to guarantee orderly production, to end wildcat strikes, to drive back the influence of the councils and to prevent a nationalisation of means of production. For their part, the employers guaranteed to introduce the eight-hour day, which the workers had demanded in vain for years. The employers agreed to the union claim of sole representation and to the lasting recognition of the unions instead of the councils. Both parties formed a "Central Committee for the Maintenance of the Economy" (Zentralausschuss für die Aufrechterhaltung der Wirtschaft).

Question: Where did the union leader meet?
Berlin