A labor camp was a place that made you work to death not immediately but slowly.
Labour camps, are as it says camps used for labour.
These particular camps were greatly used during wars. Adolf Hitler was a big supporter of Labour camps, and so was the U.S (sadley) when Japan attacked Pearl Harbor. The Labour Camps consisted of work, work, work, cold showers, bitter food, well barley any food, and work. No clean clothes were given out unless someone died and still those clothes were never washed. Labour camps were a brutal and devastating thing to happen but they did, and some people who survived them are still living as though they were their today.
Forced labor camps are where the prisoners in the camp are forced to work. These prisoners may be prisoners of war (illegal by Geneva Convention), political prisoners, ordinary criminals, etc.