Rustin and Walter Fauntroy negotiated some security issues with the government, gaining approval for private marshals with the understanding that these would not be able to act against outside agitators. The FBI and Justice Department refused to provide preventive guards for buses traveling through the South to reach D.C. William Johnson recruited more than 1,000 police officers to serve on this private force. Julius Hobson, an FBI informant who served on the March's security force, told the team to be on the lookout for FBI infiltrators who might act as agents provocateurs. Jerry Bruno, President Kennedy's advance man, was positioned to cut the power to the public address system in the event of any incendiary rally speech.