The class war over Medicare for All is here. On one side is Bernie Sanders, who recently introduced new and improved Medicare-for-All legislation with the support of a burgeoning grassroots movement and historic small-donor fundraising. On the other side is UnitedHealth, the massive health care company — the fifth-largest US corporation by total revenue of any kind — whose stocks have been plummeting since Sanders revived the bill.

UnitedHealth can no longer hide their efforts to destroy Sanders’s public health system proposal: a whistleblower recently revealed that UnitedHealth’s insurance subsidiary, UnitedHealthcare, is working hard to ensure Democrats focus on reforming the Affordable Care Act (ACA) instead of pushing for Medicare for All, which will eliminate their entire industry. When asked about their stance on Medicare for All, the company’s chief executive Steve Nelson said, “We are advocating heavily and very involved in the conversation.”

They’re also warning their investors of the bill’s potential to “destabilize the nation’s health system.” Nelson explained that the company is “trying to be thoughtful about how we enter in the conversation, because there’s a risk of seeming like it’s self-serving.” Nelson, who made $7,580,440 last year at a company that pulled out of the ACA’s exchanges, is right to fear the optics.