What is "entryism"

n. A political tactic by which an organisation or state encourages its members or agents to infiltrate another organisation in an attempt to gain recruits or take over entirely.

Entryism (also referred to as entrism or enterism, or as infiltration) is a political strategy in which an organisation or state encourages its members or supporters to join another, usually larger, organisation in an attempt to expand influence and expand their ideas and program. In situations where the organization being "entered" is hostile to entrism, the entrists may engage in a degree of subterfuge to hide the fact that they are an organisation in their own right.