Using this "apolitical" rally of Mamata Banerjee at the Maoist stronghold of West Bengal, the Left front aimed to bolster its claim on Union Railway Minister's alliance with the red rebels.
With most of the Communist Party of India-Marxist (CPI-M) MPs away attending the extended central committee meeting in Vijayawada, party leaders such as A Sampath and Bansa Gopal Chowdhury tried to lead the uproar.
The Left leaders gathered near Speaker Meira Kumar"s podium after the zero hour accusing an ally of the Congress-led UPA and its ministers of joining hands with 'anti-nationals'.
Mr Sampath sought government's clarification on the matter.
The TMC chief is set to hold a rally in West Midnapore's Lalgarh on Monday, Aug 9.
Mamata has said that would be held under the banner of an apolitical forum called Santras Birodhi Mancha (Anti-Atrocities Platform) and not the Trinamool Congress.
The pro-Maoist tribal group Peoples' Committee Against Police Atrocities (PCAPA) is also taking part in the rally.