
Well he did constantly refer to black people with the N word, including his staff he often said they were subhuman, and famously said "I’ll have these n***ers voting Democratic for the next 200 years" Here’s an article https://www.urban.org/urban-wire/reckoning-structural-racism-research-lbjs-legacy-and-urbans-next-50#:~:text=Credible%20accounts%2C%20however%2C%20revealed%20LBJ,%2C%20calling%20them%20%E2%80%9Cfurniture.%E2%80%9D
Check the source, as for the mafia he had several cases throughout his career of dealings with mafia including accepting bribes and ties with the Dallas Mafia. Here’s another source that goes into some times he was implicated . https://www.ebsco.com/research-starters/law/vice-president-lyndon-b-johnson-aide-resigns-over-crime-connections