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 <WSD>obstacle</WSD> of human solidarity - Denmark , Holland , Italy , Bulgaria , France ? 
Meaning of the word marked with <WSD> tags:  something immaterial that stands in the way and must be circumvented or surmounted