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''Reign in Blood'' is the third studio album and major label debut by the American thrash metal band Slayer. Released on October 7, 1986, the album was the band's first collaboration with record producer Rick Rubin, whose input helped the band's sound evolve. ''Reign in Blood'' was very well received by both critics and fans, and was responsible for bringing Slayer to the attention of a mainstream metal audience. ''Kerrang!'' magazine described the record as "the heaviest album of all time," and a breakthrough in thrash metal and speed metal. Alongside Metallica's ''Master of Puppets'' (released the same year) and Megadeth's Rust in Peace, ''Reign in Blood'' is considered one of the most influential thrash metal albums of all time.

''Reign in Bloods release was delayed because of concerns regarding its graphic artwork and lyrical subject matter. The opening track, "Angel of Death", which refers to Josef Mengele and describes acts, such as human experimentation, that Mengele committed at the Auschwitz concentration camp, provoked allegations of Nazism. However, the band stated numerous times they do not condone Nazism, and are merely interested in the subject. The album was Slayer's first to enter the Billboard 200; the release peaked at number 94, and was certified Gold on November 20, 1992. - Wikipedia