Objectionable treatment of trade unionists from NSZZ "Solidarność" by the management of MPWiK SA, dismissal of "S" members in violation of trade union law, deficiency of pay rises, deficiency of harmful conditions for employees of canals and sewage treatment plants - these are any of the issues raised by trade unionists at a picket organized in front of the office of the Municipal Water and Sewage Company in Warsaw.