By Sarah N. Lynch, Jan Wolfe and Aram Roston WASHINGTON (Reuters) -The former chairman of the U.S. right-wing group the Proud Boys, Enrique Tarrio, was arrested on Tuesday on a conspiracy charge for his alleged role in plotting the Jan. 6, 2021, assault on the Capitol in a bid to block certification of President Joe Biden’s election. Tarrio, 38, appeared in a virtual Miami-based federal court hearing from a cellblock in a nearby local jail, and prosecutors said they were seeking to have him detained pending trial because they believe he is a danger to the community and poses a risk of flight. …