Sakdal party leader Benigno Ramos returned to the Philippines in 1938, after three years in self-imposed Japanese exile.
The Pacific theater of the World War II was opened on December 8, 1941 (Philippine time), with the bombing of Pearl Harbor.
Many Ganap members were recruited into the Yoin, or United Nippon, an organisation dedicated to performing auxiliary and menial duties for the Japanese expeditionary force.
Widespread abuse of these duties and powers was reported, and guerrilla outfits retaliated by harassing Ganap members and their families.
[2] Although the party was a constituent of KALIBAPI, Ganap never exercised real influence within the new grouping, partly at the suggestion of Laurel and Vargas.
[1] Many of the original party followers would go on to form the basis of the militia group Makapili, which the Japanese founded in November 1944.