What is worker-priest?
Worker-priest was a missionary initiative by the French Catholic Church in particular for priests to take up work in such places as car factories to experience the everyday life of the working class. A worker-priest was any priest who was "freed from parochial work by his bishop, lived only by full-time labor in a factory or other place of work, and was indistinguishable in appearance from an ordinary workingman".
Although the movement did spread to many other countries such as Belgium and Italy, the French were always the most prominent.
The movement was an attempt to "rediscover the masses" of industrial class workers who had become largely disaffected with the church.