The article describes from the constructionist starting-point the quan
titative development of people sentenced to prison for the first time
in the 1980s in Finland. The reasons for and consequences of this deve
lopment are also examined. The data consist of a register that covers
all the decisions given by the Finnish lower courts of justice for the
period 1977-1991. The basic observation is that the number of Finnish
people defined for the first time as ''criminals'' decreased by about
20% in the 1980s. However, at the same time the penal system has incr
eased its efficiency: the number of registered crimes and sentences ha
s grown considerably. This has led to a more rapid circulation of ''cr
iminals'' between prison and the outside. At the same time, the death
rate of those labeled as criminals has increased in all age groups, wh
ich indicates the growing marginalization of that diminishing group.