One question on many people’s minds is whether polling places will be disrupted on Election Day. There are concerns that vigilantes, armed with cameras and notebooks, will intimidate voters they suspect of committing fraud. Such groups insist they’ll follow the law, but civil rights groups are on alert just in case. There have already been some disturbing incidents. In Durham, N.C., a voter reported someone videotaping license plates outside an early-polling site. In West Palm Beach, Fla., a voter complained of being intimidated by a rowdy group of electioneers. A right-wing group called Oath Keepers has appealed to its members, mostly former military and police, to go undercover at polling sites and collect intelligence about possible fraud. In an online video, the group’s president, Stewart Rhodes, asked supporters “to go out as part of our call to action, to go and hunt down, look for vote fraud and voter intimidation and document it, to do the best we can to stop it this election.” There are other efforts as well. A Texas-based group called True the Vote has a smartphone app for people to document any incidents of voter fraud they see at the polls.