Platform - commonly used term to describe the values, principles and standards of the political party.
Issue of Concern
The issue of concern is the degradation of the values, principles and standards of the political party to the point where the party is being lead by people who don't adhere to the party's official platform.
Political parties often have a written statement that lists what they value, and what their standards and beliefs are. However many of the enrolled members of a political party have never read that statement, and do not know what the official values and beliefs of the political party are. There can be misunderstandings about what the mission of the political party actually is. It has happened that individuals and groups have "hijacked" a political party for their own interests, with no real regard for the official, written statement of what the political party "stands for."
It is a problem if a political party acts in ways that do not align with the official written statement of what guides the party. Values, beliefs and standards are meaningless unless they are adhered to and enforced. The members of the political party would like to know what the political party stands for, and be able to trust that it's politicians will adhere to that.
The history of political parties shows that what they stand for and the issues they care about change drastically over time. Some political parties seem to be almost the opposite of what they originally stood for. Research doesn't need to be done to see current affects of popular leaders in a political party. A political party can become know as the party of a leading individual rather than it's stated platform.
What have I tried
I haven't tried preventing a takeover of a political party. I'm trying to generate interest in how to maintain good standards in a political party by posting this question.
What policies or procedures can political parties implement to prevent a takeover by those with different standards?