Who left one of the largest protests against the hoover administration and congress during the great depression

In March 1930, members of the Communist Party organized an unemployment rally in Union Square, later escalated into one of the worst riots in the city: 35,000 people attending the demonstration were transformed in a few moments from an orderly crowd into a fighting mob. Communist leaders brought their followers down to march on City Hall and demanded a hearing from Mayor Walker. The purpose was to spread awareness about the corrupt and inadequate management of the monopolies who raised the cost of food and rent.

answer; ///i believe that the correct answer is refrigerants,(like r12) and aerosol

your answer is a hope this