Police are searching for two vandals who allegedly smashed the windows of the GOP's Manhattan clubhouse and scrawled anarchist symbols on its doors, then left a note putting the establishment "on notice" for its decision to host far-right provocateur and Proud Boys founder Gavin McInnes on Friday.

An NYPD spokesperson says they received a call at around 2 a.m. Friday concerning two figures in dark clothing outside the Metropolitan Republican Club on the Upper East Side. When officers arrived, they found multiple windows broken at the location and glue on the locks, along with bright orange anarchist symbols spray-painted on the doors. Two bricks were also found on the sidewalk outside, police said.

"It was very upsetting, very disturbing, and really uncalled for," Ian Reilly, chairman of Republican club's board, told Gothamist. He added that an "aggressive note" had been left on the door, which, combined with the "Antifa A's" on the doorway, led him to believe that antifascists were behind the attack.

"Tonight, we put the Republican party on notice, in defiance to the policy of mass misery they have championed," the letter (above), begins. "The US government has established concentration camps around the country for Latino people, shamelessly murders black people, and continues its war machine that has slaughtered Muslim people with impunity for decades."

The note goes on to attack the club for its decision to host Gavin McInnes, the ousted VICE co-founder and leader of the Proud Boys, an online organization whose motto is "West Is Best." McInnes is scheduled to appear at the club at 6:30 p.m. tonight; a Facebook invite brags that he "exposed the Deep State Socialists and stood up for Western Values."

"While these atrocities persist unabated, the Metropolitan Republican Club chose to invite a hipster-fascist clown to dance for them, content to revel in their treachery against humanity," the letter reads.

In previous interviews, McInnes has insisted that he is not a white supremacist or member of the alt-right. But his past comments include suggesting Muslims are “more violent” due to inbreeding, referring to Asians as “slopes,” and defending the use of the N-word. He’s written for VDARE.com, which the Southern Poverty Law Center identifies as a "White Nationalist" hate group, and was recently banned by Twitter for violating the platform's policy on "violent extremist groups." Members of the Proud Boys were present at the white supremacist #UniteTheRight rally in Charlottesville where Heather Heyer was killed.

Still, Reilly said that the Republican organization does not have any misgivings about hosting McInnes, noting that the Proud Boy founder's views don't differ much from those of previous Metropolitan Club guests, like Tucker Carlson, Newt Gingrich, and Ann Coulter.

"He is part of the right," Reilly told Gothamist. "We promote people and ideas of all kinds from the right. We're open to different views. We would never invite anyone who would incite violence."

Earlier this week, McInnes posted a photo on Instagram of Otoya Tamaguchi, a Japanese ultranationalist who assassinated the head of the country's socialist party, and promised to re-enact "this inspiring moment at the Metropolitan Club."

The NYPD is investigating the vandalism.