Beware of the Jonsson Gang!

In this 1981 Swedish action comedy, Gösta Ekman stars as Sickan Jönsson, leader of the infamous gang, after a botched burglary lands him in prison and later leads to a high-stakes heist in Switzerland, where he's double-crossed by enigmatic banker Wall-Enberg Jr. (no cast member is mentioned for this role). Returning to Sweden, Sickan sets out on a calculated revenge mission against the man who betrayed him, teaming up with old accomplices Ragnar Vanheden (Ulf Brunnberg) and Rocky Blom (Nils Brandt).