What is crusade editorial?

You may be referring to a "crusading" editorial. While newspapers are expected to be objective in reporting the news, there have been a number of newspaper editors who believed in a cause and promoted it through their newspaper's editorial page. Some editors took a stand about ending child labor, or ending segregation, or exposing government corruption, etc. On the editorial page, the opinion of the editor is often considered the official viewpoint of that newspaper. So a crusading editorial would be an editorial which forcefully advocates for a specific cause and demands some kind of action.