There’s a cereal killer on the loose.

Until recently it wasn’t necessarily a bad thing for a company to wear its political leanings on its sleeve. For example, executives at Costco and Starbucks arguably scored points with customers in recent years while openly supporting progressive causes. Privately held Hobby Lobby and Chick-fil-A have had great success even as their bosses have been outspoken conservatives.

But the recent backlash against Kellogg and other companies shows that political stances can come with costs. After the cereal maker joined other companies in pulling advertising from controversial right-wing website Breitbart over hate speech, the outlet launched a #DumpKelloggs campaign and wrote articles critical of the company.

There were similar calls by Donald…