The National Day of Mourning monument was dedicated by the Canadian Labour Congress on April 28 , 1987 in Vincent Massey Park .
The Canadian Labour Congress had officially established April 28 as the Day of Mourning to workers killed and injured on the job .
The Day of Mourning       monument was dedicated by the Canadian Labour Congress on April 28 , 1987 in Vincent Massey Park .
The Canadian Labour Congress had officially established April 28 as the Day of Mourning to workers killed and injured on the job .