ERFURT, Germany (Reuters) -- Thousands protested against Germany's far-right AfD and blocked roads to its annual conference in the eastern city of Erfurt on Saturday, where the party re-elected the two leaders who have overseen its rise as a national force. Protesters from unions, civil society groups and left-wing parties gathered as large numbers of police, including reinforcements from across Germany, were deployed ahead of the AfD's two-day conference. AfD stands for Alternative for Germany.