<h1>Political party slams regulator for allowing US firm's alleged 4.5-year stock market manipulation spree</h1> A political party questioned the market regulator and government for failing to prevent a US algorithmic trading firm from allegedly manipulating Indian stock markets and making illegal profits through futures and options trading. The party spokesperson alleged the firm operated for 4.5 years, causing massive losses to retail investors while authorities remained inactive. The regulator recently banned the firm and froze approximately 4,844 crore rupees in alleged unlawful profits, representing only a fraction of total profits made. The spokesperson criticized regulatory inaction and questioned whether officials knew about the alleged market manipulation and large-scale fund repatriation.