American civil war is probably the clearest example. That was a war to defend the private ownership of the means of production. Then there are atrocities committed by capitalist governments, for example the Tasmanian genocide. [1]

Since I am headed for bed, let me preemptively quote from the Georgia's declaration of seperation [2]:

>> The people of Georgia having dissolved their political connection with the Government of the United States of America, present to their confederates and the world the causes which have led to the separation. For the last ten years we have had numerous and serious causes of complaint against our non-slave-holding confederate States with reference to the subject of African slavery. They have endeavored to weaken our security, to disturb our domestic peace and tranquility, and persistently refused to comply with their express constitutional obligations to us in reference to that property, and by the use of their power in the Federal Government have striven to deprive us of an equal enjoyment of the common Territories of the Republic.

[1] https://en.wikipedia.org/wiki/Black_War#Characterisation_as_...

[2] http://www.civilwar.org/education/history/primarysources/dec...