James Edward O'Keefe III (born June 28, 1984) is an American conservative political activist. He produces secretly recorded undercover audio and video encounters with figures and workers in academic, governmental and social service organizations, purporting to show abusive or allegedly illegal behavior by employees and/or representatives of those organizations. He has been criticized for selectively editing videos to misrepresent the context of conversations and the subjects' responses, creating the false impression that people said or did things they did not. He gained national attention for his video recordings of workers at Association of Community Organizations for Reform

O'Keefe and colleagues were arrested in New Orleans in January 2010 and 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. His 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. The four men were charged with malicious intent to damage the phone system. O'Keefe stated that he had entered Landrieu's office to investigate complaints that she was ignoring phone calls from constituents during the debate over President Barack Obama's health care bill.  The charges in the case were reduced from a felony to a single misdemeanor count of entering a federal building under false pretenses. O'Keefe and the others pleaded guilty on May 26. O'Keefe was sentenced to three years' probation, 100 hours of community service and a $1,500 fine. The other three men received lesser sentences.  In August 2013, O'Keefe revisited the incident by releasing a video entitled: "a confrontation with former U.S. Attorney Jim Letten on the campus of Tulane University". Letten is a former Republican U.S. Attorney who recused himself from the Landrieu incident because he knew the father of one of the men involved. The video shows Letten accusing O'Keefe of "terrorizing" Letten's wife at their home, of harassing him, and trespassing on the Tulane campus. He called O'Keefe a "coward" and a "spud", and referred to O'Keefe and his companions as "hobbits" and "scum".

Using a quote from the above article, answer the following question: What were they charged with?
charged with entering federal property under false pretenses with the intent of committing a felony,