A bank president stood beside the head of a big teachers unions at a glitzy Clinton Global Initiative event last month and the two pledged to invest $100 million in early childhood education. A few weeks earlier, the union had endorsed Hillary Clinton because she had come out in support of that same issue. The union, the American Federation of Teachers, also happens to be a client of the bank.

The Amalgamated Bank is union owned and has extensive ties to the Democratic establishment. It is a growing financial phenomenon managed and patronized by Big Labor’s biggest players. From the Democratic National Committee to Hillary Clinton’s presidential campaign, Amalgamated has attracted high-profile accounts with its blend of specialized political financing and ideological bent.