I'm not the biggest history person, but I'm pretty sure one of the largest causes of the French and Russian revolutions was most certainly poor living conditions.

I'm too lazy to find real sources, but from Wikipedia:

https://en.wikipedia.org/wiki/French_Revolution#Causes

Rising social and economic inequality;[12][13] new political ideas emerging from the Enlightenment;[14] economic mismanagement; environmental factors leading to agricultural failure, unmanageable national debt;[15] and political mismanagement on the part of King Louis XVI, have all been cited as laying the groundwork for the Revolution.[16][17][18][19]

https://en.wikipedia.org/wiki/Russian_Revolution#Economic_and_social_changes

Workers also had good reasons for discontent: overcrowded housing with often deplorable sanitary conditions, long hours at work (on the eve of the war, a 10-hour workday six days a week was the average and many were working 11–12 hours a day by 1916), constant risk of injury and death from poor safety and sanitary conditions, harsh discipline (not only rules and fines, but foremen's fists), and inadequate wages (made worse after 1914 by steep wartime increases in the cost of living).