Saame rise in Finland beginning 1905.
"The increase in homicide rates in Finland from the 1880s onwards is clearly connected with industrialization. As such it is not an exception even in the West European context. Many West European countries experienced a rise in violent crime during the early days of industrialization. However, in Finland this rise was much sharper and turned out to be a permanent one. And what is more: in
1905 the rise became a homicide wave, which lasted till the first half of the 1930s."
Analysis of the Finland situation.
http://www.om.fi/optula/8610.htm
"The first problem is the general trend: why did industrialization cause a much sharper and longer rise in serious violent crime in Finland than in western Europe? There are at least two probable factors in the background of this phenomenon: firstly the one-sided economic structure based on forest industry, and secondly the czarist political system. In the last decades of the 19th century and at the beginning of the new one, homicide, and especially the increase in homicide, was centred in new industrial cities and towns, especially in towns based on wood processing industry, as well as in the rural lumber communes. Unlike western Europe, in Finland industrialization was mostly based on forest industry. The new forest industrial towns arose mainly in the middle of woodland. For a long time they lacked even a basic infrastructure to house and control the population. In towns where industrialization took place in old urban setting, violent crime was considerably lower. Forest industry was also a very male-dominated industry and very sensitive to economic fluctuations. The variations in production were directly reflected in the number of workforce. Both the factors had their own impact on the demographic structure of the forest industry towns, their population consisted mainly of young single men, the turnover was high, and the housing conditions even worse than in other industrial towns. To counterbalance the dull living conditions, the income level of the workers was, however, relatively high and this meant that alcohol consumption was also high. Together all these factors provided an exceptionally explosive demographic mixture.
The same kind of conditions created violent communities also, for example, in North America."