Cook pasta in large pot of rapidly boiling water until al dente or done to your liking.
Meanwhile, prepare the sauce. Place olive oil and the garlic in a large saute pan and turn heat to medium. Cook until the garlic is fragrant and lightly golden. Add capers, anchovies, olives, and tomatoes. Cook until the tomatoes start to break down and become a sauce, about 8 minutes. Toss with cooked pasta. Add parsley and tuna and season, to taste, with salt and pepper. Serve immediately.