What were some of the hardships endured by farm laborers that led to the formation of the United Farm Workers?

1) What were some of the hardships endured by farm laborers that led to the formation of the United Farm Workers?

2) Who were the two ethnic groups who joined together to strike for better working conditions?
3) What does huelga mean in English?
4) What does sal si puedes mean in English?
5) Who is the woman who co-founded the United Farm Workers with Cesar Chavez?