Conversation so far:
What was the relation between James O'Keefe and Mary Landrieu?
James O'Keefe and colleagues were charged with entering federal property under false pretenses with the intent of committing a felony, at the office of United States Senator Mary Landrieu, a Democrat.
Who were James O'Keefe's colleagues?
James O'Keefe's three fellow activists, who were dressed as telephone repairmen when apprehended, included Robert Flanagan, the son of William Flanagan, acting U.S. Attorney of the Eastern District of Louisiana.

Question: What were they charged with?
Self-contained rewrite: What were James O'Keefe and his three fellow activists charged with?