Is the monthly salary received from the professional syndicate after retirement considered permissible, given that it is in exchange for symbolic annual subscriptions, and that we do not work in the syndicate's field?

It is permissible to receive a retirement pension from a cooperative insurance institution if the funds are invested in permissible ventures. However, if they are invested in usurious banks or prohibited activities, then participation is not allowed except out of necessity. In such a case, the participant should only take what they paid in and dispose of any excess by giving it to charitable causes, as it is unlawful money.