In August 2006, Miller Brewing faced consumer backlash after it was reported by the Chicago Tribune that the company had provided financial backing for a march in support of illegal immigrants. A company spokesman has denied this, stating that funding was only authorized for "a recent convention on immigration issues in Chicago, which provided attendees with information on how to become legally naturalized citizens of the U.S." However, to deal with a boycot threat from a larger latino community group over Miller's political action committee campaign contributions, Miller agreed to run newspaper ads against an immigration bill viewed by the group to be too harsh and to help them fight it.
And they're not even majority American-owned anymore:
It was acquired by South African Breweries from Philip Morris (now Altria) on May 30, 2002, to form SABMiller for $3.6 billion worth of stock and $2 billion in debt, with Philip Morris retaining a 36% share, with voting rights of 24.99%.