The flags carried the logo of the terror group Hezbollah. The rhetoric was the kind you'd normally hear in Tehran or Gaza.
Yet the scene occurred in Washington, D.C, just minutes from the White House.
"We must stand united to defeat, to destroy, to dismantle Israel--if possible by peaceful means," Kaukab Siddique said. "Perhaps, like Saladin, we will give them enough food and water to travel back to the lands from where they came to occupy other people."
Siddique is an associate professor of English at Lincoln University in Pennsylvania.
He used his time outside the classroom over Labor Day weekend to address radical Muslims and leftists at an anti-Israel rally in Washington, D.C. marking "Al Quds Day."
"For the Jews, I would say see what could happen to you if the Muslims wake up," Siddique warned. "And I say to the Muslims, dear brothers and sisters, unite and rise up against this hydra-headed monster which calls itself Zionism."
The Investigative Project on Terrorism captured footage of Siddique's Washington rant.
"This is not a one off deal, this event Labor Day weekend," IPT Executive Director Ray Locker told CBN News. "This is something he has said at similar events over a period of at least a dozen years, as far as we can tell."
CBN News found e-mail exchanges posted online in which Siddique called the Holocaust "a hoax" that was "invented," saying there is "not even one document" to prove it happened.
He's also written that Jews have "taken over America" by "devious and immoral means."
Despite a history of anti-Semitic statements, Siddique maintains a job teaching literature at Lincoln University and sits on at least two school committees.
Lincoln is the nation's oldest historically African-American college. Since 2003, it's received almost $200 million in Pennsylvania state money towards various projects.
Lincoln University administrators declined to appear on camera with CBN News. But the school's executive vice president, Michael Hill, told us they in no way agree with or support Siddique's comments on Israel. However, Hill added that Siddique is tenured and has freedom of speech, and the school cannot control what he does or says on his time as a private citizen.
Siddique has also advocated for two convicted terrorists with ties to al-Qaeda -- including the cleric behind the 1993 World Trade Center bombing.
"It's one thing to have strong beliefs," Locker said. "It's another to advocate violence and go to bat for people who are established terrorists."
Hill told CBN News the school will make sure that Siddique's political comments are not part of his classroom curriculum.
Siddique declined a CBN News request for an on-camera interview. But in an e-mail response to our questions, he denied that he was anti-Semitic and said his "speaking out" about Israel, "conform(s) to the ideals and principles that founded Lincoln University."
He added, "When I refer critically to the 'Jews' I am referring to the current leadership of the 'State of Israel' and to their major supporters, not to the Jewish race as a whole."
Siddique's recent statements in Washington, however, appear to suggest otherwise.
"The Koran says drive them out from where they drove you out," he declared. "There's no question of just dismantling the settlements. These settlements are only the tentacles of the devil that resides in Tel Aviv."