When Donald Trump clinched the United States presidency in a stunning upset, his victory emboldened some supporters to launch online harassment campaigns against Hillary Clintonsupporters. And Shameless star Emmy Rossum is one of the latest targets.

Rossum, a vocal Clinton supporter and one of a bevy of celebrities who lamented Clinton's loss last week, took to Twitter Sunday to expose the anti-Semitic threats she’s received in the aftermath of the election. "Trump supporters are sending me messages threatening to send me & my 'ilk' to the gas chambers & writing hashtags like '#sieg hiel (sic),'" the singer/actress, who identifies as Jewish, wrote. "NOT OK."

"Telling anyone to 'get ready for the trains' in reference to WWII is disgusting & offensive. Reporting you to Twitter is not enough," Rossum added in defense of why she decided to highlight one of the particularly virulent attacks. "Back off."

The actress later said she was not intimidated by the threats but was discouraged by what she referred to as the "vicious underbelly" of bias in the U.S.

Prior to Rossum’s revelation, Silicon Valley star Kumail Nanjiani shared a tense encounter he and co-star Thomas Middleditch had with two Trump supporters while at a bar in the Silver Lake district of liberal-leaning Los Angeles. Nanjiani said the supporters joked about trolling the actors on Twitter about Trump, attempted to engage in a political debate, and began to call the actors "cucks" — short for the derogatory "cuckservative," a portmanteau of the word "cuckold" and "conservative"— after Nanjiani stated they did not want to discuss politics.

"This happened at a bar in LA surrounded by people — I can't imagine what it must be like to be someone who looks like me in other parts," a stunned Nanjiani wrote, adding, "We can't let hate/racism/bigotry/sexism be normalized. If something happens, be safe, but let it be known we won't stand for this."

Nanjiani then addressed the argument that not all Trump supporters are inherently racist or sexist, arguing that they were, at best, complicit in his bigotry: "At best, you ignored it. You overlooked it. We thought the Internet would give us access to (people) with different points of view. Instead, it gave us access to many (people) with the same point of view."