Mezinárodní všeodborový svaz (International All-Union League, abbreviated MVS) was a national trade union centre in Czechoslovakia. MVS was founded in October 1922, after communists had been expelled from the Odborové sdružení českoslovanské (Czechoslav Trade Union Association, OSČ). MVS functioned as the trade union wing of the Communist Party of Czechoslovakia (KSČ), but parallel to MVS there were also the 'Red Trade Unions' (communist-dominated autonomous unions). MVS affiliated itself to the Red International of Labour Unions (Profintern).