The Attorney General's Guideline for Domestic FBI Investigations are public. You can read them, and the line above is not what they say. Assessments can be open with "authorized purpose but not any particular factual predicate." https://www.justice.gov/archive/opa/docs/guidelines.pdf
Preliminary Investigations require only "information or an allegation," and a 2010 Inspector General report on FBI investigations of peace activists and environmentalists said FBI agents can and do make the allegations themselves: https://oig.justice.gov/reports/review-fbis-investigations-certain-domestic-advocacy-groups-redacted-version
The Brennan Center's Emily Berman explained the broad scope of the FBI's powers here: https://papers.ssrn.com/sol3/papers.cfm?abstract_id=2112175
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