Labor Unions and Non-member Political Protest Mobilization in the United States

While political protest and labor unions are seen as important elements in democratic societies, systematic research on the relationship between the two is scarce. Past research finds that union members are more likely to engage in protest, but it is unclear whether unions increase protest among non-members. This study draws on two waves of data from the Cooperative Congressional Election Study and examines two mechanisms through which labor unions facilitate political protest among non-members: social ties and aggregate strength. We provide evidence that labor unions mobilize non-members to engage in political protest. When non-members have a social tie to a union or live in a state where unions are more robust and widespread, they are more likely to engage in political protest, but no more likely to engage in non-collective forms of political participation such as donating to political causes or contacting officials. The findings extend our understanding of an important, but understudied, act of political behavior as well as the ways that societal institutions stimulate collective political mobilization.