A peak in Kraus's political commitment was his sensational attack in 1927 on the powerful Vienna police chief Johann Schober, also a former two-term chancellor, after 89 rioters were shot dead by the police during the 1927 July Revolt. Kraus produced a poster that in a single sentence requested Schober's resignation; the poster was published all over Vienna and is considered an icon of 20th-century Austrian history.