<human>:  I have a question about the Trades Union Congress. What is the TUC?
<bot>: The TUC is the UK’s largest trade union. It was formed in 1868 and is based in London. The TUC is a federation of trade unions, representing more than 5 million workers in the UK. The TUC is a democratic organization, and its members elect the General Secretary, who is the head of the organization.