This paper examines the relationship between kin-based institutions and the state in the modern economy, exploring how clan captures the local government. Using data from China’s primary land market and a nationwide genealogy dataset, we employ spatial matching to estimate clan’s causal impacts on land parcel prices, which are a crucial source of fiscal revenue for local government. We find that firms linked to local clans obtained 1.3%-3.0% lower prices than those without clanship connections. We show that clan firms get lower prices through collusion with bidders, a process facilitated by local officials. This patron-client relationship leads to a decline in economic growth at the county level, while China’s anti-corruption campaign transforms the economic impact from negative to positive.