About 12 people clad in yellow, bearing yellow balloons, gathered in downtown Kuala Lumpur today and called for the prime minister to be ousted.

However, this was not another Bersih gathering, but the “launch” of a movement by Perikatan Nasional-linked activist group Solidariti Anak Muda Malaysia (SAMM).

SAMM founder Badrul Hisham Shaharin, better known as...