Noun
counterprotester (plural counterprotesters)
A person engaging in a counterprotest
At midday, along the east end of Freedom Plaza, a lone counterprotester stood on the sidewalk holding a sign that read “Trump is the fraud.” Source: Internet
Biden has said he decided to run for president after Trump said there were “very fine people“ on both sides of a 2017 protest led by white supremacists in Charlottesville, Virginia, where a counterprotester was killed. Source: Internet