The Samahang Demokratiko ng Kabataan (Association of Democratic Youth),[6][7] better known simply by its acronym, SDK,[8] was a mass organization of student and youth activists who pushed for the ideology of National Democracy in the Philippines during the Marcos dictatorship.
[7][9] Initially established on January 30, 1968 by activists who broke away from the Kabataang Makabayan (KM), it eventually reconciled with KM under the multi-sectoral Movement for a Democratic Philippines (MDP) in the common effort to fight the dictatorship of Ferdinand Marcos.
Declared illegal along with any other political organizations when Marcos declared Martial Law in September 1972, it was eventually dissolved in 1975 as the socialist-led resistance to Marcos' martial law administration shifted its tactics away from mass youth organizations.
[6] It was because of the influence of "Hinggil sa Legal na Pakikibaka" that the early mass organizations of the National Democracy movement, including KM and SDK, were eventually dissolved in mid-1975, as the movement decided to focus instead on other organizational forms.
[10] With the successful ouster of Ferdinand Marcos, many former members of the SDK eventually chose to serve in various ways in Philippine Government and society, with some retaining their advocacy of National Democracy, while others have moved away from that ideology.