KOLLAM: The Secular National Dravida Party has decided to support the UDF in all the 20 Lok Sabha constituencies. Party state president S.Suvarnakumar said that the LDF Government had failed to protect the interests of the backward communities in all fronts. The SC verdict on 50:50 reservation in PSC appointments was the result of a tacit understanding between the Government, PSC and the NSS, he said.