Heat olive oil in a pan over medium heat and sauté garlic and anchovies for two minutes. Add the tomatoes, olives and capers and cook until all the ingredients are heated, about three minutes. Add the red pepper flakes, parsley, and salt to taste. Keep warm. In a large pot, bring water to a boil. Add one tbsp. of salt, add the penne, and cook to al dente. Drain well. In a large serving bowl, mix the penne and three quarters of the tomato mixture. Top with the remaining mixture and serve.