counterprotest

noun

coun·​ter·​pro·​test ˈkau̇n-tər-ˌprō-ˌtest 

variants or counter-protest

plural counterprotests or counter-protests

: a protest staged to counter or oppose another protest

A rally … got heated Saturday afternoon. Police stepped in to help de-escalate tensions after a counterprotest emerged …

—Colleen MacDonald

counterprotester

ˈkau̇n-tər-ˌprō-ˌte-stər 

noun

or counter-protester

plural counterprotesters or counter-protesters

Standing near the back of the crowd at yesterday's rally were about a dozen counterprotesters …

—Sue Young Wilson

Nazis may still march, but they are inevitably outnumbered by counter-protesters.

—Ellis Cose

Word History

First Known Use

1595, in the meaning defined above