All fascism is nationalist. There’s no ‘other instance’. And a common theme in the rise of fascism is a compromise between the rich (capitalists, local gentry, etc.) and the fascist organisation, where the former bankrolls the latter in return for maintaining their economic and social position / backdoor deals / protection. Further, this usually happens as a result of some marginalised group - factory workers, serfs, women, etc. getting too uppity.