There's a ton of case law of what is legal and illegal during an organized labour dispute. Here's but one little tidbit:
The Courts in Ontario have relied on the Pepsi-Cola case and section 102(3) of the Courts of Justice Act to hold that the following type of conduct on the picket line is illegal and capable of being restrained:
1. picketers blocking company required vehicles (company trucks, suppliers’ vehicles, contractors’ vehicles, employee cars or buses) from entering or exiting the property;
2. picketers delaying these vehicles from entering and existing the property for significant time periods (anywhere from 5 to 15 minutes seen as excessive);
3. picketers causing traffic jams or congestion on public roads;
4. violence, assaults, property damage, defamation, harassment on the picket line or at staging areas to pick up or drop off managers or replacement workers.
It must be emphasized that picketers do not have the right to picket the homes of employees or managers. This is considered to be intimidation and a restriction on the free access to one’s private property.
If the picket line was completely blocking access and egress from the Base, particularly as it impacts on residents, that is clearly wrong. I suspect either an overly enthusiastic or ill-informed Strike Captain.
I suspect there is little the CoC could have directly done except call the local constabulary since I assume the picketers were on city property. Most public sector employers typically show incredible restrain, either on their own or as directed. I'm not sure restraint should extend to impact on employee's family members; they didn't sign up for that.
. Every traffic light you will ever hit red in your whole life "detains" you. 
