Barisan Sosialis
The Barisan Sosialis was the People's Action Party's strongest contenders in politics. However, Operation Coldstore had substantially weakened the Barisan as most of its key personnel had been detained. According to Matthew Jones, "the Barisan never recovered from the combined effects of the outcome of the referendum result and the 'Coldstore' detentions.” Jones also highlights that numerous Barisan leaders and members were bogged down with lawsuits and its followers were "demoralised". In addition, Tan Jing Quee mentions that "the two main pillars of the left-wing movement in Singapore, the Barisan Sosialis and SATU, were decapitated," following Operation Coldstore.