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The Financial Industry Regulatory Authority (FINRA) is the largest independent regulator for all securities firms doing business in the United States.
BrokerCheck provides information about current and former FINRA-registered brokers and brokerage firms. It also provides information about investment adviser firms and representatives through the Investment Adviser Public Disclosure website, sponsored by the Securities and Exchange Commission. Here is the database access - http://brokercheck.finra.org/Search/Search.aspx
There is no charge for reports.
However - each state has its own regulations and registration requirements - so you need to specify the location of your broker to be specific.