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There are many labour unions, you will need to be specific about which one, where and what time frame.
Pullman Strike
The governmet had the authority to end labor strikes.
The governmet had the authority to end labor strikes
Eugene Debs
Debs's conviction reinforced federal authority to halt strikes
Debs's conviction reinforced federal authority to halt strikes
1892, Socialist Labor Party: Simon Wing 1896, Socialist Labor Party: Charles Matchett 1900, Social Democratic Party: Eugene V. Debs 1904, 1908 & 1912, Socialist Party: Eugene V. Debs
Eugene Debs
It may have something to do with the Ludlow Massacre a nasty incident at a mining camp which took innocent lives when it flashed over into a riot. Reds implies communists and this took place when Communism was a very real problem and often linked with Labor organizations such as the various Debs" unions ( Eugene Victor Debs, a socialist, did visit the USSR late in his life)
Debs's conviction reinforced federal authority to halt strikes
Yes, he was a labor leader and five-time Socialist candidate for President