 It would later lead an anti-Japanese Hukbalahap Rebellion in 1942 with the Hukbo ng Bayan Laban sa Hapon.During World War II, these communist guerrillas fought against both the Japanese and other guerrilla bands.In the years following, Maoist factions began organizing mass organizations such as Kabataang Makabayan, Malayang Kilusan ng Kababaihan and hosting theoretical studies on Marxism–Leninism–Maoism.