For welfare - by applying for the benefits and not providing all the required information or providing inaccurate information.
For Social Security - by applying and meeting the eligibility requirements (there is no requirement that one file income taxes in order to receive Social Security benefits.)
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I am not sure what you are trying to get at (i.e. reporting illegal activity). However, if the entertainer earned over $400 per year, he had a requirement to file tax returns. Failure to do so would be considered a criminal offense. And, failure to do so for 20 years would be high on the IRS priority list to convict if they can.
As for welfare and social security, the previous answers appear adequate.
Marty Davidoff, email@example.com, 732-274-1600. This answer is provided for general information only. You should seek advice from an attorney or tax professional.