La Noche de los Brujos is the 10th directorial effort by Amando De Ossorio.  It followed his worldwide success "Tombs of the Blind Dead", and although  highly anticipated, appears to have been somewhat of a failure upon its initial theatrical run.  The movie was a co-production of Hesperia Films and Profilmes, both of which relatively small but lucrative production studios in Spain.

According to the IMDB, the movie was filmed mostly at a popular tourist attraction, Safari Madrid--a drive-through African Safari themed park, located in Aldea del Fresno, Madrid.

Upon release, the movie opened in Europe to mediocre box office and generally poor reviews.  Although differing from his successful 'Blind Dead' for the most part, the movie is somewhat similar as a coven of undead voodoo worshippers  rise from their rock-covered graves periodically and act out their rituals to a bloody climax, usually claiming a nubile victim or two.

The differences here, however, are pretty major.  Beyond a polar geographical change from the mountainous cathedral and castle-filled Spain to the jungles and open plains of Bumbasa, the victims here do not merely get sacrificed and turned into crab-chow. These girls are actually inducted into the sorcerers' group, becoming spunky tools of their evil leopard god, living as leopards during the daytime and turning into female vampires at night, complete with sexy and skimpy leopard-print mini-dresses, somehow stitched by apparently very crafty natives.

The movie was picked up for American distribution along with several other Spanish horror and exploitation titles by the then-thriving AVCO/Embassy Studios, under the American translated title of  Night of the Sorcerers.  The package of films eventually premiered in the United States on independent stations, mostly in larger cities.  The movie even received a rather nice push from one Forrest J. Ackerman in his Famous Monsters of Filmland magazine, appearing in the April 1978 20th Anniversary Issue.  In the article "The Aliens are Coming", it was listed along with hundreds of other horror, sci-fi and fantasy films that were either already in release or slated for future release at the time.  In addition to the listing, it was one of a handful of films that was given a thumbnail synopsis, and a rather neat still from the film was prominently featured as well, fueling reader fantasies of the horrors to come.