Blood feuds within Russian communities do exist (mostly related to criminal gangs), but are neither as common nor as pervasive as they are in the Caucasus.[citation needed] In the United States, gang warfare also often takes the form of blood feuds. A mob war is a time when two or more rival families/gangs begin open warfare with one another, destroying each other's businesses and assassinating family members. Mafia/Mob wars are generally disastrous for all concerned, and can lead to the rise or fall of a family or gang. African-American, Italian-American, Cambodian, Cuban Marielito, Dominican, Guatemalan, Haitian, Hmong, Sino-Vietnamese Hoa, Irish-American, Jamaican, Korean, Laotian, Puerto Rican, Salvadoran and Vietnamese gangs and organized crime conflicts very often have taken the form of blood feuds, in which a family member in the gang is killed and a relative takes revenge by killing the murderer as well as other members of the rival gang. This can also be observed in particular cases in conflicts among Colombian, Mexican, Brazilian, and other Latin American gangs, drug cartels, and paramilitary groups; in turf wars among Cape Coloured gangs in South Africa; in gang fights among Dutch Antillean, Surinamese and Moluccan gangs in the Netherlands; and in criminal feuds between Scottish, White British, Black and Mixed British gangs in the UK. This has resulted in gun violence and murders in cities like Chicago, Detroit, Los Angeles, Miami, Ciudad Juarez, Medellin, Rio de Janeiro, Cape Town, Amsterdam, London, Liverpool, and Glasgow, to name just a few. The Five Families of New York City New York go to great lengths to avoid a war, as not only do the families lose considerable money and valuable men, gangland killings also cause public outrage and can trigger mass crackdowns from authorities like the Federal Bureau of Investigation FBI.