1st source  

On 27 April, the workers continued to block the gate of the bus depot by forming a human barrier. They refused to move despite repeated warnings. The police then used batons to disperse the crowds resulting in 15 people injured. The police action generated sympathy for the workers. Eight hundred SBWU members employed by other companies stopped work between 10 am and 2 pm on that day to protest against “police bullying”.

Author
Stephanie Ho, S.H, 6 August 2014, Hock Lee bus strike and riot, 22nd August 2014

2nd source

“The Hock Lee bus riots is a dark reminder of how quickly the radical left could mastermind and unleash chaos. It was an era where chaos and disorder were used as political tools to gain control. But in the midst of hardship and suffering, conflict and sacrifice, Singapore found a way to peace, prosperity, and independence.”

Source:

http://www.theonlinecitizen.com/2014/02/hock-lee-bus-riots-fact-or-fiction-by-cna-part-2/