Tripartite alliance members who associate with the Friends of the Youth League should be expelled, Young Communist League secretary Buti Manamela said on Sunday.

"We cannot have such friends. Friends who behave in that manner can only be categorised as enemies, and we must treat them as such. If you associate with the enemies of the movement, you must also be regarded as an enemy," he said.

"Any member of the Young Communist League, and I hope members of the ANC Youth League... who associate themselves with former members of our structures must regard their membership as immediately terminated."

Manamela was speaking at a rally for the SA Communist Party's 91st anniversary, at the Johannesburg City Hall.

The Friends of the Youth League was formed after former African National Congress Youth League president Julius Malema was expelled earlier this year. It was created to give him a platform to speak.

Manamela said the organisation was formed in order to follow "individuals" and not the aims of the ANCYL.

Congress of SA Trade Unions (Cosatu) president S'dumo Dlamini said at the rally that enemies of the movement should identify themselves as such.

"We cannot be enemies just because we have tactical differences. Enemies should be defined by the cause they wish to follow," he said.

"Those who define themselves as such, have to be dealt with as such."

Dlamini said the main enemy of the revolution was "white monopoly capital".

He said the "real enemy" had planted disunity in the alliance.

He said Cosatu would defend the outcomes of the ANC's last elective conference in Polokwane, especially against "the agenda that seeks to off-set the [ANC] leadership".

Manamela said the Democratic Alliance should be regarded as enemies of the movement.

"Our role as the YCL and the ANCYL... in order to ensure that we properly celebrate the 91st anniversary of the SACP is to declare war on the DA, and not on ourselves."

SACP Gauteng secretary Jacob Mamabolo said the party would "confront" the DA in Midvaal, south of Johannesburg.

"Starting next week Sunday, the 12th of August, exactly at 10am, the SACP in our province, with the red brigade, will be visiting the Midvaal, the base of the counter-revolutionary DA," he said.

"We must go to the Midvaal, and we must bring those flags [SACP flags]. We must have these flags flying very high in the backyard of the DA."

He said the party would also conduct a door-to-door campaign in the province to inform people about the "facts" of President Jacob Zuma's tenure, while it assessed him before the ANC's elective conference in Mangaung.

The SACP would also "confront" the SA Broadcasting Corporation and remind it that it was an "instrument of the people" and not business, he said.

The Johannesburg City Hall was awash with the SACP's characteristic red and black colours, as members stamped their feet, sang songs and waved flags ahead of a speech by SACP general secretary Blade Nzimande.

At the foot of the stage were two large red cakes, surrounded by bottles of champagne.

Printing on the cakes was: "91 years of militant struggle for socialism" and "1921 - 2012".

The party celebrated it's anniversary on Tuesday.