OPEC imposes an oil embargo against countries they deem to have helped Israel in the Yom Kippur War.

In October 1973, the Organization of Arab Petroleum Exporting Countries (OAPEC) announced that it was implementing a total oil embargo against countries that had supported Israel at any point during the 1973 Yom Kippur War, which began after Egypt and Syria launched a large-scale surprise attack in an ultimately unsuccessful attempt to recover the territories that they had lost to Israel during the 1967 Six-Day War.

No gas 1974
No gas 1974 (Source: Wikimedia Commons)
Gas Stealers Beware 1974
Gas Stealers Beware 1974 (Source: Wikimedia Commons)
FLAG POLICY DURING THE 1973 oil crisis
FLAG POLICY DURING THE 1973 oil crisis (Source: Wikimedia Commons)
Gasoline rations - Bureau of Engraving and Printing
Gasoline rations - Bureau of Engraving and Printing (Source: Wikimedia Commons)

Watch: Leere Tankstellen und autofreie Sonntage: Wie kam es zur Ölkrise 1973? | ZDFinfo Doku

From the ZDFinfo Dokus & Reportagen channel.

Sources and further reading: Wikipedia — 1973 oil crisis (CC BY-SA). Images: Wikimedia Commons.