 In 1974, Kronberg became a national committee member of the National Caucus of Labor Committees (NCLC), part of the LaRouche movement.He was the production editor of their newspaper, "New Solidarity", edited their magazine, "The Campaigner", and later co-founded and edited "Fidelio", a publication of LaRouche's Schiller Institute.He was a founding board member of Caucus Distributors, one of the key LaRouche companies.