In a large saucepan, cook the bacon over moderately high heat until crisp, about 6 minutes. Using a slotted spoon, transfer the bacon to a plate. Pour off all but 2 tablespoons of the fat and return the saucepan to moderately high heat. Add the escarole, minced garlic and crushed red pepper and season with salt and black pepper. Cook, stirring, until the escarole wilts, about 2 minutes.