There are at least two bands called Soul Assassins:
1) Soul Assassins are a loose collective of musicians and graphic artists affiliated to the hiphop group Cypress Hill, formed in the early 90s. It is also the name of Cypress Hill's publishing company. In 1997 and 2000 two albums under the name Soul Assassins were released. Both albums featured an army of rappers and both were almost entirely produced by Cypress Hill's beatsmith DJ Muggs, with minor contributions by The Alchemist (three songs) and DJ Khalil (one song) on the second volume.