A grassroots group is calling for a 24-hour “economic blackout,” and urging people not to shop at major retailers Friday as a form of protest against corporations, politicians and banks — and the social media-driven campaign has gained traction among several celebrities.

People's Union plans another broad-based economic blackout on March 28, but it's also organizing boycotts targeting specific retailers — Walmart and Amazon — as well as global food giants Nestle and General Mills.