How do you deal with the lack of "job security"?

[Btaliat]

Among the issues with freelancing is lack of job security. This means, you don't have a permanent contact with any clients. You can be removed as you can be hired. That's why it is always better for freelancers to be making use of contracts. This will make it difficult for the clients to discard them anyhow without any tangible reason. What other things do you think can be done to protect the freelancers from lack of job security.