Organisations can only join by providing evidence they are licensed and properly insured.
Some are also breaking the law by not having a Scottish Environmental Protection Agency licence.
Recycling Clothes Company Ltd
ITS charity partners include Be Child Cancer Aware, Asthma UK and Against Breast Cancer (Trading) Ltd.
The amount handed to charity ranges from £75 to £90 per tonne.
Lithuanian Mindaugas Okunis is its sole director.
Unaudited accounts say it made just £12,519 last year.
In 2013 the firm was fined for operating without a licence.
The company, which was denied a licence after saying it would hand over just £75 from every £800 raised, was fined £2,860.
ESSEX-based, its charity partners include Heart UK, Colostomy Association and Lithuanian cancer charity Do Not Delay!
Run by Lithuanian Raimondas Biguzas, Intersecond was denied a licence to operate in three English counties after failing to specify how much it would donate.
Biguzas is also a director in four other companies, including another clothing firm.
He said the company was registered with all relevant bodies and gave £100 per tonne to good causes.
BASED in Wales, Audosta Ltd says it works with partner charities such as Woodlands Cancer Care, Rags 2 Riches 4 Schools and KidsOut, according to its website.
Its sole director is Lithuanian Audrius Stasiulevicius, 42.
It gives just £50 per tonne to charities.
In June 2013, a Welsh council revoked its collection licence after it donated just £12.50 to charity from a collection worth £267.45.
Mr Stasiulevicius declined to comment.
MYSTERIOUS firm which operates on behalf of Glasgow-based genetic disease charity Ragdolls UK.
It says it gives a minimum of £300 per month to the charity.
It isn’t registered with SEPA, so is operating illegally.
Dr Tracey Connelly, of Ragdolls UK, said: “A Polish guy runs it, we have only spoken on the phone.
“We have no complaints.”
Mega did not return our calls.
Clothing Collection Assistance Ltd
BASED at an accountant’s office in Hamilton, it carries out collections for Throat Cancer Foundation.
Directors are Polish-born Adam Mozdzanowski, 53, and Krystian Mozdzanowski, 22.
It’s not known how much it gives to charity. It is also not registered with SEPA.
Jamie Rae, founder of the Throat Cancer Foundation, said: “I was not aware it was not meeting regulations.”
Clothing Collection Team Ltd
BASED at the same Hamilton accountant’s office as Clothing Collection Assistance.
In 2013, Save The Children ordered it to stop using the charity’s name on flyers.
The company alleged it gave the charity £50 a week – claims rubbished by Save The Children.
Directors are Polish-born Wojciech Kupidura, 39, and Seweryn Wolczynski, 36.
One its flyers claims it donated £6,000 to charity.
Not registered with SEPA, its annual returns are overdue, according to Companies House.