The 1922 Bridgman Convention was a secret conclave of the underground Communist Party of America (CPA) held in August 1922 near the small town of Bridgman, Michigan, about 90 miles (140 km) outside of the city of Chicago on the banks of Lake Michigan. The convention, called by the CPA as its annual gathering for the election of officers and making of internal decisions, was attended by a delegate who was secretly an employee of the Bureau of Investigation, who informed his superiors of the date and general location of the gathering. The convention was raided by local and federal law enforcement authorities on August 22, 1922, and a number of participants and a large quantity of documents seized in an operation which garnered national headlines. Two 1923 test trials of the Michigan criminal