Why were Marxist political parties banned after the 1973 coup in Chile?

Following the 1973 military coup in Chile, the military junta led by Gen. Augusto Pinochet banned Marxist political parties as part of a broader effort to consolidate power and dismantle the socialist government of Salvador Allende.123

The military regime viewed the repression of left-wing political forces as a necessary step to eliminate the influence of the previous administration and restore order following a period of intense political polarization, economic instability, and social unrest. While the junta initially received support from some moderate political forces who believed the dictatorship would be a temporary transition to restore the status quo, the military government soon moved to suppress all political opposition.23

In addition to outlawing Marxist parties, the regime suspended the constitution, dissolved Congress, and eventually placed other traditional political parties into "indefinite recess" before dissolving them entirely in 1977. These bans remained in place until constitutional amendments were negotiated and approved in a 1989 national referendum, which revoked the prohibition on Marxist parties as the country transitioned back to representative democracy.243