The Jungle (1914 film)
The Jungle 1914 is an American drama silent film made by the AllStar Feature Corporation starring George Nash. The film is an adaptation of the 1906 book of the same name by Upton Sinclair, the only one to date. Sinclair reportedly bought the negative of the film prior to 1916, hoping to market the film nationally after its initial release in 1914. Sinclair himself appears at the beginning and end of the movie, as a sort of endorsement of the film.
Source: Wikipedia