How did union strikes contribute to rising racial tensions in the 1920s?

Responses
A Blacks were allowed to join most unions.Blacks were allowed to join most unions.
B Unions could not negotiate with management.Unions could not negotiate with management.
C Factory owners would hire blacks as strikebreakers.Factory owners would hire blacks as strikebreakers.
D Immigrants joined unions at a greater rate than others.

C Factory owners would hire blacks as strikebreakers.

During the 1920s, when unions went on strike to demand better wages and working conditions, factory owners often hired black workers as strikebreakers to undermine the effectiveness of the strikes. This led to tensions between white union members and black strikebreakers, contributing to rising racial tensions.