Sentence:  Finally , if the mission of the Trial was to convict anti-Semitism , how could it have failed to post before the world the contrasting fates of the countries in which the Final Solution was aided by native Jew haters - i.e. , Germany , Poland , Hungary , Czechoslovakia - and those in which it met the obstacle of human <WSD>solidarity</WSD> - Denmark , Holland , Italy , Bulgaria , France ? 
Meaning of the word marked with <WSD> tags:  a union of interests or purposes or sympathies among members of a group