From Wikipedia:

Tankie has its origins in British political rhetoric. It has since become a popular pejorative in English-language social media.[22] In 2017, left-wing writer Carl Beijer argued that there are two distinct uses of the term tankie. The original, which was "exemplified in the sending of tanks into Hungary to crush resistance to Soviet communism". More generally, a tankie is someone who tends to support "militant opposition to capitalism", and a more modern online variation, which means "something like 'a self-proclaimed communist who indulges in conspiracy theories and whose rhetoric is largely performative.'"

Ok. Thanks.