Patricia Kirwan, the former Conservative chair of housing on Westminster, said: 'Officers were being bullied into doing political work because they were frightened of getting the sack.
'I didn't think they should have been asked to write political papers.'
Mrs Kirwan was giving evidence to the inquiry after she was summoned as a witness by former council leader Dame Shirley Porter and Tory MP Barry Legg.
Mrs Kirwan was the first senior Westminster Tory member to expose the alleged 'homes-for-votes' plot.
She had opposed the scheme to sell off many of the council's homes and had also fallen out with Dame Shirley.
She told the inquiry that the scheme was 'drawn up with a view to increasing the Tory vote in eight key marginal wards - that was wrong'.