sentences:  The ensuing investigation tried to discover where the core of support for the strike lay, and while some 4,000 workers were moved to other mining areas in the following months, others were said to have ended up in labour camps on the Danube-Black Sea Canal.The main strike leaders disappeared within weeks, with other outspoken miners rounded up piecemeal and dispersed over the next few months.The concessions held long enough for the authorities to break the organisational backbone of the resistance, but eventually most of these were withdrawn and the eight-hour workday imposed, though this was not made official until 1983.