There are mutliple artists with this name:
1. Assassin is a German thrash metal formed in 1983. They are one of the first German thrash metal bands, best known for their debut album - The Upcoming Terror.
2. Assassin is a French hip-hop act formed in the late 1980s by Rockin’ Squat (real name Mathias Cassel) and Solo, later joined by Doctor L and DJ Clyde. True to their musical and lyrical roots, Assassin are primarily interested in social criticism and uncompromising music. Read more on Last.fm