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A bunch of low-rank soldiers who team up to keep E-4s and lower from getting screwed over by higher-ups who don't know their ass from a hole in the ground. They laugh in the face of bad leadership and say things like "I didn't know" to cover their dumb ass.
"I didn't know the whole unit was gonna get shamed for my dumb mistake," said the E-4 who got blamed for the latrine fire.
The E-4 Mafia met in the back of the supply truck to plot revenge on the SFC who didn't know the word "prior service".
When the E-3 got in trouble for not showing up to PT, the whole Mafia sent him a group text saying: "We got your back, bud."