In the early 1920s, Feleo worked as a school teacher in his own town, eventually devoting his time defending tenants in Santa Rosa against landlords who threatened to evict them.
[3] His involvement in the KPMP eventually led him to be a central member of the Partido Komunista ng Pilipinas during its initial founding, heading the PKP Peasant Department.
By March of the following year, he and other elements of the PKP, most notably Luis Taruc, met in Cabiao, Nueva Ecija to form the Hukbalahap, a guerrilla movement aimed at defending against the Japanese.
[5] After the war, the KPMP and the Pampanga-based Aguman ding Maldang Talapagobra were reformed into the Pambansang Kaisahan ng mga Magbubukid.
[2] Feleo also involved himself the Democratic Alliance and as a spokesperson for Huk veterans during the post-war period, in addition to his PKM duties.
A turning point was after the 1946 elections, when six Democratic Alliance candidates, including Luis Taruc, won seats in Congress but were not allowed to sit in session.
[2] On August 24, 1946, Feleo, on his way back to Manila after a pacification sortie in Cabiao, was stopped by a large band of "armed men in fatigue uniforms" in Gapan, Nueva Ecija.
Thousands of Huk veterans and PKM members were sure that Feleo was murdered by landlords, or possibly the Roxas administration itself.