Just two days after a career criminal allegedly gunned down NYPD officer Randolph Holder in East Harlem, and with his fellow officers still mourning, anti-police activists took to Times Square on Thursday to protest "police terror and murder."

Holder’s murder on Tuesday night made him the fourth NYPD officer to die in the line of duty in the last year, which has also seen anti-police groups call for killing police. But the demonstrators who carried signs at 47th street and Broadway decrying "victims of police murder" seemed oblivious to the trauma felt throughout the city after Holder, an African-American and second-generation police officer, was killed trying to protect New Yorkers.

"People have had enough of the anti-cop protest, and it's time these people go get a job and find a different agenda," Sergeants Benevolent Association President Ed Mullins told FoxNews.com.

Given the prevalence of "Black Lives Matter" signs at the event, including on one large, yellow cloth held by members of the so-called Granny Peace Brigade, a protester was asked if the life of Holder, who was black, also mattered.

"I would hope that his family realizes that his life is included in that ‘Black Lives Matter’ slogan," said protester Qiara Butler.

The three-day "National March to STOP Police Terror" on Thursday, Friday, and Saturday is set to have events in numerous city spots, among them Washington Square Park and Bryant Park in Manhattan and a march to Barclay’s Center in Brooklyn later Thursday. The event was "initiated" by activists Dr. Cornel West and Carl Dix, a self-described revolutionary. Several high-profile "selected endorsers" for the event include former Weather Underground terrorist Bill Ayers, actors Ed Asner and Mark Ruffalo, and singer Harry Belafonte.