PAD leaders were joined behind bars by prominent members of the red-shirt United Front of Democracy against Dictatorship (UDD), who rallied to expel PM Abhisit Vejjajiva in 2009-2010.
And on Wednesday, People's Democratic Reform Committee (PDRC) leaders were sent to jail for their role in 2013-14 protests to oust PM Yingluck Shinawatra. Among them were two current government ministers and an ex-minister.
PAD, UDD and PDRC leaders were handed the prison sentences for causing chaos with their protests.