He was a member of the Parliament of Finland from 1921 to 1938, representing the Agrarian League.
As Lahdensuo had received threats, a group of men, one of whom was Kustaa Tiitu, had gathered to protect him and they managed to repel the attackers.
The incident led to several Lapua Movement activists being arrested and convicted.
Jalo Lahdensuo's niece was married to Vihtori Kosola, who was the leader of the Lapua Movement.
[1] This article about a Centre Party (Finland) politician is a stub.