The victim was identified as Ali Akbar, 35, of Mandra village and organizing secretary of Munshiganj Pouro Jubo Dal.
Police rescued the body from near the Sadarghat launch terminal at 10 am.
Another report from Savar said a businessman was killed by unknown assailants at Emandipur village in Savar municipal area today.
Sabdul Alim, 36, betel leaf trader, was found dead in an abandoned house in the morning. His hands and legs were tied with rope.
Family sources said Sabdul was missing since Wednesday night.
Savar thana officer said the suspected killers were identified. They are trying to round them up soon.