Attorney-General A. Mitchell Palmer conducted a series of raids. ... The most spectacular of the "Palmer raids" occurred in
January 1920.
– "Start-up of the Department and World War I,
1913-1921," U. S. Department of Labor, www. dol. gov
(accessed November 21, 2013)
What was the primary reason for the raids described in this excerpt?

we pointed them north: recollections of a cowpuncher by e.c. “teddy blue” abbott tells us of the history of nomad cowboys in north america. as the   frontiers began moving west, trails of cowboys of the 1870s and ’80s drove herds of cattle from texas to the northern ranges and railheads, and then rode back south to do it again. they gradually pushed   native americans out of their lands, until in 1889 the   government transferred white   colonists the indian land.

" true it was, that such atempts were not to be made and undertaken without good ground & reason; not rashly or lightly as many have done for curiositie or hope of gaine"