A local film, titled "Dr Lim Hock Siew", by filmmaker Martyn See Tong Ming has been banned by Singapore authorities with effect from July 14.
Censors banned the film, saying it was 'against the public interest'.
Dr Lim was a former leader of the Barisan Sosialis party.
According to a statement from the Ministry of Information, Communication and the Arts (MICA), the film gives a distorted and misleading portrayal of Dr Lim's arrests and detention under the Internal Security Act (ISA) in 1963.
"The Singapore Government will not allow individuals who have posed a security threat to Singapore's interests in the past, to use media platforms such as films to make baseless accusations against the authorities, give a false portrayal of their previous activities in order to exculpate their guilt, and undermine public confidence in the Government in the process."
Under the Films Act, possession and distribution of a prohibited film is an offence.
An offender is liable on conviction to a fine not exceeding $10,000 or to imprisonment for a term not exceeding two years, or both.