The entry of digital platform corporations, such as Uber, Lyft, and Taxify, into established taxi and limousine markets has severely challenged organized interest groups on both sides of the capital-labor divide as well as public policymakers who regulate these markets. Interest associations in different countries have regarded the market-disrupting strategies of platform corporations as either a unifying threat or as an opportunity to pursue and enforce their particularistic interests, and existing associational fields have shaped interest associations’ responses.The author compares California and Austria because of their distinctive traditions in valorizing the public participation of nonstate societal groups and interest associations in ...