Well I know personally two American Breslovers who were vigorously (ie black eyes and knocked out tooth) beaten up in Uman by the "Breslov Modesty Patrol" in 2004 for having a 'lliason' with a Ukrainian blonde.
An Orthodox Jew is not allowed to have sex with his wife for 12 days per month, and when presented with available & willing Ukrainian gentile females, who are the third most beautiful women in the world, some find it a temptation beyond endurance.
Breslov FFBs are pretty OK.
But Breslov attracts droves of a certain type of BT, many of whom have criminal backgrounds, and who can't help but temporarily lapse in to the vernacular when given the chance.
What has to be said in praise of Breslov (which is far from being a monolithic, unified group - with no rebbe and many factions) is that like Chabad they have always been strongly against "Land for Peace", unlike the other Hassidic & Haredi groups, and regularly make forays in to Shchem and Yericho.