UP CM Yogi Adityanath felicitated over 600 sanitation workers at 'Swachhata Mitra Samman Samaroh' in Varanasi on Thursday, calling them 'foundation stones' of society. The event marked the conclusion of a 76-day cleanliness campaign by MLA Dr Neelkanth Tiwari. Yogi personally honoured 11 workers on stage with flowers and kits.