Rotella's technique is called Decollage, which is basically the opposite of collage. Decollage removes sections or pieces of an original, whereas collage is comprised of sections taken from other places and put together to create a new piece. Its an interesting technique in that you must know from where you want something removed because removing too much of it means the piece will not work or be ruined. So a fair amount of self control is needed.
Nouveau Realisme, to which Rotella was a member (along with Yves Klein, and Jacques Villeglé, two other artists worth checking out if you haven't already..), was a French movement founded in 1960 that was seen as Paris' answer to the American Pop Art movement.
http://en.wikipedia.org/wiki/Nouveau_Réalisme

"tragico '59" - 1961

"pepsicola" - 1960

"Marilyn" - 1963

"la tigre" - 1962

"homage au president" - 1963
More about Mimmo Rotella:
Wikipedia: http://en.wikipedia.org/wiki/Mimmo_Rotella
Gallery biography: http://www.arasgallery.com/profile.php?id=33
More works: http://rogallery.com/Rotella_Mimmo/rotellahm.htm