Anchor: This, some argue, gave employers the ability to require more from Bracero workers based on a threat or promise they would be sent back to Mexico.
Entailed: Some argue that employers got more from Bracero workers after threatening deportation. 
Contradiction: No one argues that employers lost the ability to require anything of Bracero workers after their threat. 
Contradiction: The astronomer already knew what it was.
Contradiction: I've never seen a place where we reuse grocery bags.
Contradiction: Boy has on white shirts.
Contradiction: A group of musicians are performing.