Bring a large pot of salted water to a boil and cook the pasta according to package instructions.
While the pasta cooks, heat olive oil in a large pan.
Add the anchovy fillets and break them down with a spoon until they dissolve into the oil.
Add the minced garlic and red pepper flakes and sauté until lightly golden and aromatic.
Pour in the tomatoes and stir.
Add olives, capers, and oregano. Simmer uncovered for 10 minutes to thicken.
Drain the pasta, reserving some cooking water.
Add pasta to the pan and toss well to coat with the sauce.
Add a splash of pasta water if the sauce needs loosening.
Taste and season with salt and pepper.
Finish with fresh parsley and serve immediately.