The Goldman Sachs Municipal Income Fund Institutional Shares (GSMTX) is a mutual fund that primarily invests in municipal bonds issued by state and local governments. This fund is managed by Goldman Sachs Asset Management and aims to provide investors with a steady stream of tax-free income. As an institutional share class, it is designed for larger investors such as institutions and high net worth individuals. With a focus on municipal bonds, this fund offers a relatively low-risk investment option for those seeking tax-exempt income.