 Marek Jan Chodakiewicz writes that a number of Polish Jews were executed for denouncing other Jews.He notes that since Nazi informers often denounced members of the underground as well as Jews in hiding, the charge of collaboration was a general one and sentences passed were for cumulative crimes.The Home Army units under the command of officers from left-wing Sanacja, the Polish Socialist Party as well as the centrist Democratic Party welcomed Jewish fighters to serve with Poles without problems stemming from their ethnic identity.