scratch (someone`s) back
to do something for someone in the hope that they will do something for you
"You scratch my back and I`ll scratch yours," the customer said when we talked about the new sales contract.
Premchand arrived in Mumbai on 31 May 1934 to try his luck in the Hindi film industry. He had accepted a script writing job for the production house Ajanta Cinetone, hoping that the yearly salary of INR 8000 would help him overcome his financial troubles. He stayed in Dadar, and wrote the script for the film Mazdoor (The Labourer). The film, directed by Mohan Bhawnani, depicted the poor conditions on the labour class. Premchand himself did a cameo as the leader of labourers in the film. Some influential businessmen managed to get a stay on its release in Mumbai. The film was released in Lahore and Delhi, but was banned again after it inspired the mill workers to stand up against the owners. Ironically, the film inspired the workers of his own loss making press in Benares to launch a strike, after they were not paid their salaries. By 1934 35, Premchands Saraswati Press was under a heavy debt of INR 4000, and Premchand was forced to discontinue the publication of Jagaran. Meanwhile, Premchand was beginning to dislike the non literary commercial environment of the Mumbai film industry, and wanted to return to Benares. However, he had signed a one year contract with the production house. He ultimately left Mumbai on 4 April 1935, before the completion of one year. Himanshu Roy, the founder of Mumbai Talkies, tried to convince Premchand to stay back, but did not succeed.