sentences:  In addition, the Bulgarian government tried to alter the ethnic composition of the region, by expropriating land and houses from Greeks in favour of Bulgarian settlers (former refugees from Macedonia and others), and by the introduction of forced labour and of economic restrictions for the Greeks in an effort to force them to migrate.A spontaneous and badly organized uprising around Drama, Greece in late September 1941 was violently crushed by the Bulgarian Army.By late 1941, more than 100,000 Greeks had been expelled from the Bulgarian occupation zone.