I came across this book: 
Greater than kings: Ukrainian pioneer settlement in Canada
It looks like it's out of print but still available from sources like eBay and others. It covers the period from 1891 to 1920. I don't recall reading about it in that book but there was a very dark chapter in the Ukrainians and their treatment by Canada. There are still a few memorials standing in SK, that testify to the Ukrainians being rounded up and sent to segregation/labor camps during what we now call WWI. Labor shortages prompted English businessmen of the area to use the cheap labor afforded by residents of the camps, for their profit.