zealotry

excessive intolerance of opposing views

The character and behavior of a zealot; excess of zeal; fanatical devotion to a cause.

from Latin 'zeal' + '-otry'

“It was only the uncultured who held their artistic and political creeds with the narrowness of Little Bethel, importing into thought and aesthetics the zealotry they had lost in religion.”

— Israel Zangwill, Without Prejudice

“Through his zealotry as well as his legal and verbal dexterity, he quickly established himself as the most feared judge in Nazi Germany and the personification of the Nazi ideology in domestic law.”