FINRA is the Financial Industry Regulatory Authority. It is "the largest independent regulator for all securities firms doing business in the United States," according to its website.
FINRA is a nongovernmental organization dedicated to protecting investors and maintaining market integrity. It educates and licenses brokers and monitors their behavior and applies sanctions. It oversees more than 640,000 registered securities representatives.
It also provides investor education including basic information and warnings about scams.