T-Men and G-Men are terms used to refer to federal law enforcement agents. The term 'T-Men' was coined in the 1930s by the Treasury Department to refer to its agents, while 'G-Men' was a nickname given to FBI agents in the 1920s. Both terms are still used today to refer to federal law enforcement agents. The crossword solution for the term T-Men and G-Men is 'FEDS', which stands for Federal Enforcement Agents.