rtokens: Re-education through labour is an administrative punishment with a maximum of three years that can be imposed by police without recourse to prosecutors or the courts .
pos: JJ NN , NNP , CD , DT JJ NN IN DT CD NNP NNP NN , VBD VBN TO VB CD NN IN " NN IN NN " , CC VBD IN IN JJ NN .
tokens: Last month , Wang , 45 , a veteran dissident of the 1979 Democracy Wall movement , was ordered to serve one year of " re-education through labour " , but released because of poor health .
ltokens: The group demanded Wang 's release and said his detention was a dangerous signal China was returning to its Cultural Revolution days .