The anti-government protest movement started in February, with flash mob protests in response to the dissolution of the Future Forward Party.
Sporadic, and typically very small, gatherings that followed began to gain momentum last month, with protests occurring nearly daily.
With Monday’s rally of 4,000 the largest so far, the movement has yet to gain mainstream traction, and there is no certainty they will build.
However, in a signal that authorities appear to be growing more concerned, police made their first arrests of protesters last week.
Two pro-democracy activists were arrested under charges including sedition and breaking coronavirus rules, then released on bail.
Others allege intimidation and harassment, claims denied by the police who say they are simply monitoring the protests.
Despite the risk of arrest, prominent activist Parit Chiwarak — also known as “Penguin” — remains resolute.
“We must fight no matter what.”