(Accuse CleanPower of interfering with union talks among its workers at American Family Insurance...) Worker advocates are calling on American Family Insurance to prevent what they say are attempts by its cleaning company to stop janitors at American Family's Madison headquarters from organizing. As part of the Justice for Janitors movement, the Interfaith Coalition for Worker Justice of South Central Wisconsin is calling on the insurance giant to stop CleanPower, a large Wisconsin janitorial service company, from interfering with efforts by the Service Employees International Union to organize the janitors.A letter expressing surprise at anti-labor tactics at American Family's headquarters...