The word infiltrator refers to a person or group of people who gradually gain access to a place or organization with the aim of carrying out an ulterior motive. Synonyms for infiltrators include spies, moles, agents, saboteurs, embeds, plants, sneaks, and intruders. These words all refer to people who use covert tactics to gain access to information or to inflict harm on a group. Whether it is a corporate setup, political organization, or a military mission, infiltrators are always a threat to the system. It is essential to identify and expose the infiltrators to protect the security and integrity of the group or organization.