Laban ng Makabayang Masang Pilipino (Struggle of the Patriotic Filipino Masses) was the umbrella political coalition party of the opposition during the 1998 Philippine Presidential Elections that lead to the presidency of then Vice President Joseph Estrada. It was the largest political on that time, uniting the major parties of Senator Edgardo Angara (LDP-Aurora)'s Laban ng Demokratikong Pilipino (Struggle of Democratic Filipinos), tycoon Eduardo Cojuangco 's Nationalist People's Coalition and Vice President Joseph Estrada's Partido ng Masang Pilipino (Party of the Filipino Masses) along with minor and regional parties. Estrada's running mate, Senator Edgardo Angara lost to Senator Gloria Macapagal Arroyo (LAKAS-Pampanga). Joseph Estrada won against runner-up then House Speaker Jose de Venecia Jr. (LAKAS-Pangasinan) with 3.1 million plurality and Estrada's coalition controls the both Houses of Congress and majority of elected positions locally.

During the 2001 Midterm Legislative Elections, LAMMP was abolished and was replaced by a new coalition of Pro-Estrada legislators, named Puwersa ng Masa (PnM)(Force of the Masses) lead by Estrada's wife, Luisa Ejercito Estrada .