Great informative article. Note that "M-13" is often used for MS-13, and "M-18" (erroneously?) for B-18, which can be a bit confusing. ETA: It's not erroneous,

Great informative article. Note that "M-13" is often used for MS-13, and "M-18" (erroneously?) for B-18, which can be a bit confusing. ETA: It's not erroneous, as that gang is known as either Barrio 18 or Mara 18. At any rate, ignore the letters - it's 18 vs 13.