Based on Freeman's model of interest group-driven migration policies, the article gives a qualitative inside look on a neglected actor during the formative years of US immigration reform. It analyzes the central role of the shipping companies in coordinating the pro-immigration campaign with and against other interest groups. Their lobbying is divided into two complementary sections: inside top-down efforts (lobbyists) to influence legislators and outside bottom-up efforts (migrant communities and the press) to mobilize the public. It assesses the importance of public opinion in their lobby campaigns and the shipping companies' success in delaying far-reaching restrictions until 1917. [ABSTRACT FROM AUTHOR]