Oak Bluffs police are investigating four signs that were placed around town over the weekend in support of a white supremacist group. Police found Patriot Front signs tacked to poles on various roads downtown Sunday morning, Oak Bluffs police chief Jonathan Searle said. The group, which has placed signs and done other attention-grabbing demonstrations in other parts of the country, is one of the most visible white supremacist groups in the U.S., according to the Anti-Defamation League. Three signs, some of which read Strong Families, Strong Nations and America First, were initially found on utility poles, according to Chief Searle....