Viljo Rosvall and Janne Voutilainen were two Finnish-Canadian unionists from Thunder Bay, Ontario and members of the Lumber Workers Industrial Union of Canada who mysteriously disappeared on November 18, 1929. The two were on their way to a bushcamp near Onion Lake to recruit sympathetic bushworkers for a large strike which was gaining momentum west of Thunder Bay in Shabaqua and Shebandowan.
The bodies of Rosvall and Voutilainen were found by a union search party, which included Aate Pitkanen, at Onion Lake the following spring. The men's funeral on April 28, 1930 was the largest ever held in Thunder Bay. Adding to the legendary status of the event, a solar eclipse darkened the sky as the funeral procession marched to Riverside Cemetery. The funeral events were regarded as the symbolic beginning of the Great Depression for local residents.
The official cause of death was ruled to be accidental drownings, however, the Finnish community in Thunder Bay suspected that the two were murdered by thugs employed by the bushcamp boss. Evidence that the two men had struggled before their deaths as well as the questionable matter that two experienced bushworkers had drowned in shallow water added to the feeling that foul play was involved. Furthermore, some community members claimed that they had gained knowledge that the hired thugs were in Finland, where they had been shipped after the murder.
The case of Rosvall and Voutilainen continues to be controversial. An Ontario Historical Plaque was erected by the province to commemorate Rosvall and Voutilainen's role in Ontario's heritage. The plaque was erected in the memory of the two men in Centennial Park which has a small logging museum and is located approximately 20 kilometres downstream on Current River which flows out of Onion Lake where the bodies were found. The plaque reads
On November 18, 1929, Finnish-Canadians Viljo Rosvall and Janne Voutilainen left the Port Arthur area for Onion Lake, 20 kilometres upstream from here to recruit bushworkers for a strike. Their bodies were found at Onion Lake the following spring. Local unionists and many Finnish-Canadians suspected foul play, but coroner's juries ruled the deaths accidental drownings. The two men's funeral on April 28, 1930, is remembered as the largest ever held in Port Arthur. As thousands of mourners marched to Riverside Cemetery, an eclipse of the sun darkened the sky. The mystery surrounding the deaths of Rosvall and Voutilainen endures, sustaining them in public memory as martyrs to the cause of organized labour.