A Traditionalist Catholic, he served as Bishop of San Fernando de La Union from 1981 to 1993, later on his life he joined the Society of Saint Pius X.

During the Japanese occupation of World War II, he and his fellow novices were forced to continue their studies at Immaculate Conception Seminary in Vigan City.

Leaving the Divine Word Missionaries to serve the Diocese of Tuguegarao, Lazo was ordained to the priesthood by Archbishop Mariano Madriaga on March 22, 1947.

During his tenure, Lazo oversaw the construction of a seminary, chancery, episcopal residence, two convents, and St. Joseph Pastoral Center.

Appeals were made by Cardinal Jaime Sin and Archbishop Diosdado Talamayan for Lazo to discontinue his association with the SSPX, but he refused.

But if the Conciliar reforms are planned for the destruction of the Catholic Religion founded by Jesus Christ, then, I refuse to give my cooperation."