The yellow dog contracts are now proscribed, however in the early 20th century such agreements among employers: (i) Not to purchase intermediate goods made by unionized labor hindered labor market transformations. (ii) And workers stating that the workers would not join a union were much common. (iii) Were employed primarily to block the communist takeovers of the industrial unions. (iv) And unions made feather-bedding an extensive practice.
Can someone please help me in finding out the accurate answer from the above options.