Why Did Labor Unions Change Anything?

In earlier times, having a job included unfair treatment. There were no sick days, you had low wages, and even getting injured wasn't liable to the employer. This wasn't fair to many people so something had to be done. Many people created labor unions during these times. Did these labor unions change anything? Labor unions were formed to fight these unfair treatment of employers. Including the previously stated, no sick days, bad wages, and general unfair treament. Strikes and boycotts were held as a weapon to fight. People held strikes, ceasing work until their employer met needs. During the forming of these unions, some actually saw problems intead of progress. Three unions were fromed, the NLU, KOL, and the AFl. The national labor