Amazon workers in more than 20 countries will strike and protest starting Friday through Monday in actions organized by the Swiss-based UNI Global Union.

Amazon workers in more than 20 countries including the U.S. plan to strike and hold protests between Black Friday, November 29, and Cyber Monday, which falls on December 2, according to the activists organizing the labor action.

Amazon workers in more than 20 countries plan to strike and take part in protests starting on Black Friday, one of the biggest annual shopping days for retailers. The protest efforts will go on into Cyber Monday, one of the biggest online shopping days of the year.