Which organization was formed by the copperheads?

The Copperheads were a faction of Northern Democrats during the American Civil War who opposed the war and advocated for an immediate peace settlement with the Confederacy. They did not form a specific organization but were part of the Democratic Party, particularly prominent in the Midwest, with notable figures like Clement L. Vallandigham leading their efforts. The term "Copperhead" itself was used derogatorily to describe their anti-war stance and resistance to Lincoln's policies.