A notable feature of the Sedition Act is that in addition to punishing actions that tend to undermine the administration of government, the Act also criminalizes actions which promote feelings of ill-will or hostility between different races or classes of the population. In contrast to arrests and prosecutions in the 1950s and 1960s which involved allegations of fomenting disaffection against the government, those in the 21st century such as the District Court cases of "Public Prosecutor v. Koh Song Huat Benjamin" (2005) and "Public Prosecutor v. Ong Kian Cheong" (2009) have centred around acts and publications tending to have the latter effect. Academics have raised concerns about whether the Sedition Act was satisfactorily interpreted in those cases, and whether the use of "feelings" as a yardstick to measure seditious tendencies is appropriate.