Where was Brotherhood of Death filmed?
1976 film by Bill Berry
Brotherhood of Death (1976) was filmed in Montgomery County, Bowie and Smithfield, 3 places named in its Wikipedia article's Production section, in the United States. Wikidata records no filming location for it at all, so the article is the only recorded source. Each place says where its claim comes from.
Places per Wikipedia's Production section
Wikipedia’s Production section names 3 places. Each links to the sentence that says so.