Let 'Em Know is the fourth EP by Californian rock band Papa Roach. It was released in 1999. Each track would later be re-recorded and revamped for their first major-label 2000 album, Infest (with "Tightrope" appearing as a hidden track at the end of the album and "Legacy" being only on the clean and UK versions of the album), excluding "Walking Thru Barbed Wire" which would later appear on the next album, Lovehatetragedy. After this release, the band would sign with DreamWorks Records, and release Infest.