But Congress is not likely to act quickly on any proposal to rein in such groups, Mr. Doggett said.
Unlike individual psychotherapy, the connections made in such groups can be integrated into the participants' lives beyond the group.
Jonathan Hollander, director of the 20-year-old Downtown Dance Festival, has noticed a special esprit de corps in such groups of young dancers.
She invests much of her personal wealth in such groups as EMILY's List, National Coalition Against Censorship and the National Organization for the Reform of Marijuana Laws.
Low-mass stars also are formed in associations called T associations after the prototypical stars found in such groups, T Tauri stars.
Sets of 16 stones (bianqing) were used in Confucian ritual orchestras and survive today in such groups in Korea, where they are called p'yŏn'gyŏng.
Provisional national data from Public Health England suggests that up to the end of January take-up of the flu vaccine in targeted groups in England was running at under 50% despite it being free for people in such groups.
But in a statement, the Heidelberg prosecutor's office said: "Intensive investigations have not found any evidence to date that the suspects were members of a terrorist organization or had contacts with people in such groups".
She said low turnout in such groups was "a real risk" and the "in" campaign needed to be clear that "nothing is in the bag and the polling shows that".
Conspiratorial thinking is endemic in such groups with critics being regarded as agents of some ominous interest group – big pharma is a common bogeyman – that wants to conceal the truth.
Norway's sovereign wealth fund, the world's biggest, has excluded 52 coal-related companies in line with new ethical guidelines barring it from investing in such groups, Norway's central bank said on Thursday.
