Bring pot of water to a boil.
Open can of anchovies and remove hairs. With a knife, cut and mash (with the side of your blade) the anchovies until it forms a paste.
Heat large pan over medium, add olive oil and allow to warm for 2-3 minutes.
Add garlic and cook for 1 minute.
Add the tomato sauce, anchovies, salt, basil, oregano and olives to the pot. Cook, stirring occasionally, for 20 minutes.
Add pasta to the water and cook according to the package. Drain pasta and return to the pot with the butter.
To serve, plate a portion of the pasta and cover with the puttanesca sauce.