The term 'PARTY IN POWER' refers to the political party that is currently in control of a GOVERNMENT. The acronym INS stands for Immigration and Naturalization Service, which is a branch of the United States federal GOVERNMENT responsible for immigration and naturalization. The GOVERNMENT is the governing body of a nation, state, or other political entity. In this context, it is the GOVERNMENT that is currently in power, which is controlled by the party in power.